BLOG-45 fix: XSS html issue

frontend/package.json

@@ -28,6 +28,7 @@
 		"eslint-config-prettier": "^10.0.1",
 		"eslint-plugin-svelte": "^3.0.0",
 		"globals": "^16.0.0",
+		"isomorphic-dompurify": "^2.26.0",
 		"markdown-it": "^14.1.0",
 		"prettier": "^3.4.2",
 		"prettier-plugin-svelte": "^3.3.3",

frontend/pnpm-lock.yaml

@@ -50,6 +50,9 @@ importers:
       globals:
         specifier: ^16.0.0
         version: 16.3.0
+      isomorphic-dompurify:
+        specifier: ^2.26.0
+        version: 2.26.0
       markdown-it:
         specifier: ^14.1.0
         version: 14.1.0
@@ -90,6 +93,37 @@ packages:
     resolution: {integrity: sha512-30iZtAPgz+LTIYoeivqYo853f02jBYSd5uGnGpkFV0M3xOt9aN73erkgYAmZU43x4VfqcnLxW9Kpg3R5LC4YYw==}
     engines: {node: '>=6.0.0'}
 
+  '@asamuzakjp/css-color@3.2.0':
+    resolution: {integrity: sha512-K1A6z8tS3XsmCMM86xoWdn7Fkdn9m6RSVtocUrJYIwZnFVkng/PvkEoWtOWmP+Scc6saYWHWZYbndEEXxl24jw==}
+
+  '@csstools/color-helpers@5.0.2':
+    resolution: {integrity: sha512-JqWH1vsgdGcw2RR6VliXXdA0/59LttzlU8UlRT/iUUsEeWfYq8I+K0yhihEUTTHLRm1EXvpsCx3083EU15ecsA==}
+    engines: {node: '>=18'}
+
+  '@csstools/css-calc@2.1.4':
+    resolution: {integrity: sha512-3N8oaj+0juUw/1H3YwmDDJXCgTB1gKU6Hc/bB502u9zR0q2vd786XJH9QfrKIEgFlZmhZiq6epXl4rHqhzsIgQ==}
+    engines: {node: '>=18'}
+    peerDependencies:
+      '@csstools/css-parser-algorithms': ^3.0.5
+      '@csstools/css-tokenizer': ^3.0.4
+
+  '@csstools/css-color-parser@3.0.10':
+    resolution: {integrity: sha512-TiJ5Ajr6WRd1r8HSiwJvZBiJOqtH86aHpUjq5aEKWHiII2Qfjqd/HCWKPOW8EP4vcspXbHnXrwIDlu5savQipg==}
+    engines: {node: '>=18'}
+    peerDependencies:
+      '@csstools/css-parser-algorithms': ^3.0.5
+      '@csstools/css-tokenizer': ^3.0.4
+
+  '@csstools/css-parser-algorithms@3.0.5':
+    resolution: {integrity: sha512-DaDeUkXZKjdGhgYaHNJTV9pV7Y9B3b644jCLs9Upc3VeNGg6LWARAT6O+Q+/COo+2gg/bM5rhpMAtf70WqfBdQ==}
+    engines: {node: '>=18'}
+    peerDependencies:
+      '@csstools/css-tokenizer': ^3.0.4
+
+  '@csstools/css-tokenizer@3.0.4':
+    resolution: {integrity: sha512-Vd/9EVDiu6PPJt9yAh6roZP6El1xHrdvIVGjyBsHR0RYwNHgL7FJPyIIW4fANJNG6FtyZfvlRPpFI4ZM/lubvw==}
+    engines: {node: '>=18'}
+
   '@esbuild/aix-ppc64@0.25.8':
     resolution: {integrity: sha512-urAvrUedIqEiFR3FYSLTWQgLu5tb+m0qZw0NBEasUeo6wuqatkMDaRT+1uABiGXEu5vqgPd7FGE1BhsAIy9QVA==}
     engines: {node: '>=18'}
@@ -640,6 +674,9 @@ packages:
   '@types/resolve@1.20.2':
     resolution: {integrity: sha512-60BCwRFOZCQhDncwQdxxeOEEkbc5dIMccYLwbxsS4TUNeVECQ/pBJ0j09mrHOl/JJvpRPGwO9SvE4nR2Nb/a4Q==}
 
+  '@types/trusted-types@2.0.7':
+    resolution: {integrity: sha512-ScaPdn1dQczgbl0QFTeTOmVHFULt394XJgOQNoyVhZ6r2vLnMLJfBPd53SB52T/3G36VI1/g2MZaX0cwDuXsfw==}
+
   '@typescript-eslint/eslint-plugin@8.38.0':
     resolution: {integrity: sha512-CPoznzpuAnIOl4nhj4tRr4gIPj5AfKgkiJmGQDaq+fQnRJTYlcBjbX3wbciGmpoPf8DREufuPRe1tNMZnGdanA==}
     engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
@@ -709,6 +746,10 @@ packages:
     engines: {node: '>=0.4.0'}
     hasBin: true
 
+  agent-base@7.1.4:
+    resolution: {integrity: sha512-MnA+YT8fwfJPgBx3m60MNqakm30XOkyIoH1y6huTQvC0PwZG7ki8NacLBcrPbNoo8vEZy7Jpuk7+jMO+CUovTQ==}
+    engines: {node: '>= 14'}
+
   ajv@6.12.6:
     resolution: {integrity: sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==}
 
@@ -786,6 +827,14 @@ packages:
     engines: {node: '>=4'}
     hasBin: true
 
+  cssstyle@4.6.0:
+    resolution: {integrity: sha512-2z+rWdzbbSZv6/rhtvzvqeZQHrBaqgogqt85sqFNbabZOuFbCVFb8kPeEtZjiKkbrm395irpNKiYeFeLiQnFPg==}
+    engines: {node: '>=18'}
+
+  data-urls@5.0.0:
+    resolution: {integrity: sha512-ZYP5VBHshaDAiVZxjbRVcFJpc+4xGgT0bK3vzy1HLN8jTO975HEbuYzZJcHoQEY5K1a0z8YayJkyVETa08eNTg==}
+    engines: {node: '>=18'}
+
   debug@4.4.1:
     resolution: {integrity: sha512-KcKCqiftBJcZr++7ykoDIEwSa3XWowTfNPo92BYxjXiyYEVrUQh2aLyhxBCwww+heortUFxEJYcRzosstTEBYQ==}
     engines: {node: '>=6.0'}
@@ -795,6 +844,9 @@ packages:
       supports-color:
         optional: true
 
+  decimal.js@10.6.0:
+    resolution: {integrity: sha512-YpgQiITW3JXGntzdUmyUR1V812Hn8T1YVXhCu+wO3OpS4eU9l4YdD3qjyiKdV6mvV29zapkMeD390UVEf2lkUg==}
+
   deep-is@0.1.4:
     resolution: {integrity: sha512-oIPzksmTg4/MriiaYGO+okXDT7ztn/w3Eptv/+gSIdMdKsJo0u4CfYNFJPy+4SKMuCqGw2wxnA+URMg3t8a/bQ==}
 
@@ -809,6 +861,9 @@ packages:
   devalue@5.1.1:
     resolution: {integrity: sha512-maua5KUiapvEwiEAe+XnlZ3Rh0GD+qI1J/nb9vrJc3muPXvcF/8gXYTWF76+5DAqHyDUtOIImEuo0YKE9mshVw==}
 
+  dompurify@3.2.6:
+    resolution: {integrity: sha512-/2GogDQlohXPZe6D6NOgQvXLPSYBqIWMnZ8zzOhn09REE4eyAzb+Hed3jhoM9OkuaJ8P6ZGTTVWQKAi8ieIzfQ==}
+
   enhanced-resolve@5.18.2:
     resolution: {integrity: sha512-6Jw4sE1maoRJo3q8MsSIn2onJFbLTOjY9hlx4DZXmOKvLRd1Ok2kXmAGXaafL2+ijsJZ1ClYbl/pmqr9+k4iUQ==}
     engines: {node: '>=10.13.0'}
@@ -817,6 +872,10 @@ packages:
     resolution: {integrity: sha512-V0hjH4dGPh9Ao5p0MoRY6BVqtwCjhz6vI5LT8AJ55H+4g9/4vbHx1I54fS0XuclLhDHArPQCiMjDxjaL8fPxhw==}
     engines: {node: '>=0.12'}
 
+  entities@6.0.1:
+    resolution: {integrity: sha512-aN97NXWF6AWBTahfVOIrB/NShkzi5H7F9r1s9mD3cDj4Ko5f2qhhVoYMibXF7GlLveb/D2ioWay8lxI97Ven3g==}
+    engines: {node: '>=0.12'}
+
   esbuild@0.25.8:
     resolution: {integrity: sha512-vVC0USHGtMi8+R4Kz8rt6JhEWLxsv9Rnu/lGYbPR8u47B+DCBksq9JarW0zOO7bs37hyOK1l2/oqtbciutL5+Q==}
     engines: {node: '>=18'}
@@ -974,6 +1033,22 @@ packages:
     resolution: {integrity: sha512-0hJU9SCPvmMzIBdZFqNPXWa6dqh7WdH0cII9y+CyS8rG3nL48Bclra9HmKhVVUHyPWNH5Y7xDwAB7bfgSjkUMQ==}
     engines: {node: '>= 0.4'}
 
+  html-encoding-sniffer@4.0.0:
+    resolution: {integrity: sha512-Y22oTqIU4uuPgEemfz7NDJz6OeKf12Lsu+QC+s3BVpda64lTiMYCyGwg5ki4vFxkMwQdeZDl2adZoqUgdFuTgQ==}
+    engines: {node: '>=18'}
+
+  http-proxy-agent@7.0.2:
+    resolution: {integrity: sha512-T1gkAiYYDWYx3V5Bmyu7HcfcvL7mUrTWiM6yOfa3PIphViJ/gFPbvidQ+veqSOHci/PxBcDabeUNCzpOODJZig==}
+    engines: {node: '>= 14'}
+
+  https-proxy-agent@7.0.6:
+    resolution: {integrity: sha512-vK9P5/iUfdl95AI+JVyUuIcVtd4ofvtrOr3HNtM2yxC9bnMbEdp3x01OhQNnjb8IJYi38VlTE3mBXwcfvywuSw==}
+    engines: {node: '>= 14'}
+
+  iconv-lite@0.6.3:
+    resolution: {integrity: sha512-4fCk79wshMdzMp2rH06qWrJE4iolqLhCUH+OiuIgU++RB0+94NlDL81atO7GX55uUKueo0txHNtvEyI6D7WdMw==}
+    engines: {node: '>=0.10.0'}
+
   ignore@5.3.2:
     resolution: {integrity: sha512-hsBTNUqQTDwkWtcdYI2i06Y/nUBEsNEDJKjWdigLvegy8kDuJAS8uRlpkkcQpyEXL0Z/pjDy5HBmMjRCJ2gq+g==}
     engines: {node: '>= 4'}
@@ -1009,6 +1084,9 @@ packages:
     resolution: {integrity: sha512-41Cifkg6e8TylSpdtTpeLVMqvSBEVzTttHvERD741+pnZ8ANv0004MRL43QKPDlK9cGvNp6NZWZUBlbGXYxxng==}
     engines: {node: '>=0.12.0'}
 
+  is-potential-custom-element-name@1.0.1:
+    resolution: {integrity: sha512-bCYeRA2rVibKZd+s2625gGnGF/t7DSqDs4dP7CrLA1m7jKWz6pps0LpYLJN8Q64HtmPKJ1hrN3nzPNKFEKOUiQ==}
+
   is-reference@1.2.1:
     resolution: {integrity: sha512-U82MsXXiFIrjCK4otLT+o2NA2Cd2g5MLoOVXUZjIOhLurrRxpEXzI8O0KZHr3IjLvlAH1kTPYSuqer5T9ZVBKQ==}
 
@@ -1018,6 +1096,10 @@ packages:
   isexe@2.0.0:
     resolution: {integrity: sha512-RHxMLp9lnKHGHRng9QFhRCMbYAcVpn69smSGcq3f36xjgVVWThj4qqLbTLlq7Ssj8B+fIQ1EuCEGI2lKsyQeIw==}
 
+  isomorphic-dompurify@2.26.0:
+    resolution: {integrity: sha512-nZmoK4wKdzPs5USq4JHBiimjdKSVAOm2T1KyDoadtMPNXYHxiENd19ou4iU/V4juFM6LVgYQnpxCYmxqNP4Obw==}
+    engines: {node: '>=18'}
+
   jiti@2.4.2:
     resolution: {integrity: sha512-rg9zJN+G4n2nfJl5MW3BMygZX56zKPNVEYYqq7adpmMh4Jn2QNEwhvQlFy6jPVdcod7txZtKHWnyZiA3a0zP7A==}
     hasBin: true
@@ -1026,6 +1108,15 @@ packages:
     resolution: {integrity: sha512-wpxZs9NoxZaJESJGIZTyDEaYpl0FKSA+FB9aJiyemKhMwkxQg63h4T1KJgUGHpTqPDNRcmmYLugrRjJlBtWvRA==}
     hasBin: true
 
+  jsdom@26.1.0:
+    resolution: {integrity: sha512-Cvc9WUhxSMEo4McES3P7oK3QaXldCfNWp7pl2NNeiIFlCoLr3kfq9kb1fxftiwk1FLV7CvpvDfonxtzUDeSOPg==}
+    engines: {node: '>=18'}
+    peerDependencies:
+      canvas: ^3.0.0
+    peerDependenciesMeta:
+      canvas:
+        optional: true
+
   json-buffer@3.0.1:
     resolution: {integrity: sha512-4bV5BfR2mqfQTJm+V5tPPdf+ZpuhiIvTuAB5g8kcrXOZpTT/QwwVRWBywX1ozr6lEuPdbHxwaJlm9G6mI2sfSQ==}
 
@@ -1136,6 +1227,9 @@ packages:
   lodash.merge@4.6.2:
     resolution: {integrity: sha512-0KpjqXRVvrYyCsX1swR/XTK0va6VQkQM6MNo7PqW77ByjAhoARA8EfrP1N4+KlKj8YS0ZUCtRT/YUuhyYDujIQ==}
 
+  lru-cache@10.4.3:
+    resolution: {integrity: sha512-JNAzZcXrCt42VGLuYz0zfAzDfAvJWW6AfYlDBQyDV5DClI2m5sAmK+OIO7s59XfsRsWHp02jAJrRadPRGTt6SQ==}
+
   magic-string@0.30.17:
     resolution: {integrity: sha512-sNPKHvyjVf7gyjwS4xGTaW/mCnF8wnjtifKBEhxfZ7E/S8tQ0rssrwGNn6q8JH/ohItJfSQp9mBtQYuTlH5QnA==}
 
@@ -1193,6 +1287,9 @@ packages:
   natural-compare@1.4.0:
     resolution: {integrity: sha512-OWND8ei3VtNC9h7V60qff3SVobHr996CTwgxubgyQYEpg290h9J0buyECNNJexkFm5sOajh5G116RYA1c8ZMSw==}
 
+  nwsapi@2.2.20:
+    resolution: {integrity: sha512-/ieB+mDe4MrrKMT8z+mQL8klXydZWGR5Dowt4RAGKbJ3kIGEx3X4ljUo+6V73IXtUPWgfOlU5B9MlGxFO5T+cA==}
+
   optionator@0.9.4:
     resolution: {integrity: sha512-6IpQ7mKUxRcZNLIObR0hz7lxsapSSIYNZJwXPGeF0mTVqGKFIXj1DQcMoT22S3ROcLyY/rz0PWaWZ9ayWmad9g==}
     engines: {node: '>= 0.8.0'}
@@ -1209,6 +1306,9 @@ packages:
     resolution: {integrity: sha512-GQ2EWRpQV8/o+Aw8YqtfZZPfNRWZYkbidE9k5rpl/hC3vtHHBfGm2Ifi6qWV+coDGkrUKZAxE3Lot5kcsRlh+g==}
     engines: {node: '>=6'}
 
+  parse5@7.3.0:
+    resolution: {integrity: sha512-IInvU7fabl34qmi9gY8XOVxhYyMyuH2xUNpb2q8/Y+7552KlejkRvqvD19nMoUW/uQGGbqNpA6Tufu5FL5BZgw==}
+
   path-exists@4.0.0:
     resolution: {integrity: sha512-ak9Qy5Q7jYb2Wwcey5Fpvg2KoAc/ZIhLSLOSBmRmygPsGwkVVt0fZa0qrtMz+m6tJTAHfZQ8FnmB4MG4LWy7/w==}
     engines: {node: '>=8'}
@@ -1376,6 +1476,9 @@ packages:
     engines: {node: '>=18.0.0', npm: '>=8.0.0'}
     hasBin: true
 
+  rrweb-cssom@0.8.0:
+    resolution: {integrity: sha512-guoltQEx+9aMf2gDZ0s62EcV8lsXR+0w8915TC3ITdn2YueuNjdAYh/levpU9nFaoChh9RUS5ZdQMrKfVEN9tw==}
+
   run-parallel@1.2.0:
     resolution: {integrity: sha512-5l4VyZR86LZ/lDxZTR6jqL8AFE2S0IFLMP26AbjsLVADxHdhB/c0GUsH+y39UfCi3dzz8OlQuPmnaJOMoDHQBA==}
 
@@ -1383,6 +1486,13 @@ packages:
     resolution: {integrity: sha512-xal3CZX1Xlo/k4ApwCFrHVACi9fBqJ7V+mwhBsuf/1IOKbBy098Fex+Wa/5QMubw09pSZ/u8EY8PWgevJsXp1A==}
     engines: {node: '>=6'}
 
+  safer-buffer@2.1.2:
+    resolution: {integrity: sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==}
+
+  saxes@6.0.0:
+    resolution: {integrity: sha512-xAg7SOnEhrm5zI3puOOKyy1OMcMlIJZYNJY7xLBwSze0UjhPLnWfj2GF2EpT0jmzaJKIWKHLsaSSajf35bcYnA==}
+    engines: {node: '>=v12.22.7'}
+
   semver@7.7.2:
     resolution: {integrity: sha512-RF0Fw+rO5AMf9MAyaRXI4AV0Ulj5lMHqVxxdSgiVbixSCXoEmmX/jk0CuJw4+3SqroYO9VoUh+HcuJivvtJemA==}
     engines: {node: '>=10'}
@@ -1440,6 +1550,9 @@ packages:
     resolution: {integrity: sha512-LnSywHHQM/nJekC65d84T1Yo85IeCYN4AryWYPhTokSvcEAFdYFCfbMhX1mc0zHizT736QQj0nalUk+SXaWrEQ==}
     engines: {node: '>=18'}
 
+  symbol-tree@3.2.4:
+    resolution: {integrity: sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==}
+
   tailwindcss@4.1.11:
     resolution: {integrity: sha512-2E9TBm6MDD/xKYe+dvJZAmg3yxIEDNRc0jwlNyDg/4Fil2QcSLjFKGVff0lAf1jjeaArlG/M75Ey/EYr/OJtBA==}
 
@@ -1455,6 +1568,13 @@ packages:
     resolution: {integrity: sha512-tX5e7OM1HnYr2+a2C/4V0htOcSQcoSTH9KgJnVvNm5zm/cyEWKJ7j7YutsH9CxMdtOkkLFy2AHrMci9IM8IPZQ==}
     engines: {node: '>=12.0.0'}
 
+  tldts-core@6.1.86:
+    resolution: {integrity: sha512-Je6p7pkk+KMzMv2XXKmAE3McmolOQFdxkKw0R8EYNr7sELW46JqnNeTX8ybPiQgvg1ymCoF8LXs5fzFaZvJPTA==}
+
+  tldts@6.1.86:
+    resolution: {integrity: sha512-WMi/OQ2axVTf/ykqCQgXiIct+mSQDFdH2fkwhPwgEwvJ1kSzZRiinb0zF2Xb8u4+OqPChmyI6MEu4EezNJz+FQ==}
+    hasBin: true
+
   to-regex-range@5.0.1:
     resolution: {integrity: sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==}
     engines: {node: '>=8.0'}
@@ -1463,6 +1583,14 @@ packages:
     resolution: {integrity: sha512-sf4i37nQ2LBx4m3wB74y+ubopq6W/dIzXg0FDGjsYnZHVa1Da8FH853wlL2gtUhg+xJXjfk3kUZS3BRoQeoQBQ==}
     engines: {node: '>=6'}
 
+  tough-cookie@5.1.2:
+    resolution: {integrity: sha512-FVDYdxtnj0G6Qm/DhNPSb8Ju59ULcup3tuJxkFb5K8Bv2pUXILbf0xZWU8PX8Ov19OXljbUyveOFwRMwkXzO+A==}
+    engines: {node: '>=16'}
+
+  tr46@5.1.1:
+    resolution: {integrity: sha512-hdF5ZgjTqgAntKkklYw0R03MG2x/bSzTtkxmIRw/sTNV8YXsCJ1tfLAX23lhxhHJlEf3CRCOCGGWw3vI3GaSPw==}
+    engines: {node: '>=18'}
+
   ts-api-utils@2.1.0:
     resolution: {integrity: sha512-CUgTZL1irw8u29bzrOD/nH85jqyc74D6SshFgujOIA7osm2Rz7dYH77agkx7H4FBNxDq7Cjf+IjaX/8zwFW+ZQ==}
     engines: {node: '>=18.12'}
@@ -1542,6 +1670,26 @@ packages:
       vite:
         optional: true
 
+  w3c-xmlserializer@5.0.0:
+    resolution: {integrity: sha512-o8qghlI8NZHU1lLPrpi2+Uq7abh4GGPpYANlalzWxyWteJOCsr/P+oPBA49TOLu5FTZO4d3F9MnWJfiMo4BkmA==}
+    engines: {node: '>=18'}
+
+  webidl-conversions@7.0.0:
+    resolution: {integrity: sha512-VwddBukDzu71offAQR975unBIGqfKZpM+8ZX6ySk8nYhVoo5CYaZyzt3YBvYtRtO+aoGlqxPg/B87NGVZ/fu6g==}
+    engines: {node: '>=12'}
+
+  whatwg-encoding@3.1.1:
+    resolution: {integrity: sha512-6qN4hJdMwfYBtE3YBTTHhoeuUrDBPZmbQaxWAqSALV/MeEnR5z1xd8UKud2RAkFoPkmB+hli1TZSnyi84xz1vQ==}
+    engines: {node: '>=18'}
+
+  whatwg-mimetype@4.0.0:
+    resolution: {integrity: sha512-QaKxh0eNIi2mE9p2vEdzfagOKHCcj1pJ56EEHGQOVxp8r9/iszLUUV7v89x9O1p/T+NlTM5W7jW6+cz4Fq1YVg==}
+    engines: {node: '>=18'}
+
+  whatwg-url@14.2.0:
+    resolution: {integrity: sha512-De72GdQZzNTUBBChsXueQUnPKDkg/5A5zp7pFDuQAj5UFoENpiACU0wlCvzpAGnTkj++ihpKwKyYewn/XNUbKw==}
+    engines: {node: '>=18'}
+
   which@2.0.2:
     resolution: {integrity: sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==}
     engines: {node: '>= 8'}
@@ -1551,6 +1699,25 @@ packages:
     resolution: {integrity: sha512-BN22B5eaMMI9UMtjrGd5g5eCYPpCPDUy0FJXbYsaT5zYxjFOckS53SQDE3pWkVoWpHXVb3BrYcEN4Twa55B5cA==}
     engines: {node: '>=0.10.0'}
 
+  ws@8.18.3:
+    resolution: {integrity: sha512-PEIGCY5tSlUt50cqyMXfCzX+oOPqN0vuGqWzbcJ2xvnkzkq46oOpz7dQaTDBdfICb4N14+GARUDw2XV2N4tvzg==}
+    engines: {node: '>=10.0.0'}
+    peerDependencies:
+      bufferutil: ^4.0.1
+      utf-8-validate: '>=5.0.2'
+    peerDependenciesMeta:
+      bufferutil:
+        optional: true
+      utf-8-validate:
+        optional: true
+
+  xml-name-validator@5.0.0:
+    resolution: {integrity: sha512-EvGK8EJ3DhaHfbRlETOWAS5pO9MZITeauHKJyb8wyajUfQUenkIg2MvLDTZ4T/TgIcm3HU0TFBgWWboAZ30UHg==}
+    engines: {node: '>=18'}
+
+  xmlchars@2.2.0:
+    resolution: {integrity: sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==}
+
   yallist@5.0.0:
     resolution: {integrity: sha512-YgvUTfwqyc7UXVMrB+SImsVYSmTS8X/tSrtdNZMImM+n7+QTriRXyXim0mBrTXNeqzVF0KWGgHPeiyViFFrNDw==}
     engines: {node: '>=18'}
@@ -1576,6 +1743,34 @@ snapshots:
       '@jridgewell/gen-mapping': 0.3.12
       '@jridgewell/trace-mapping': 0.3.29
 
+  '@asamuzakjp/css-color@3.2.0':
+    dependencies:
+      '@csstools/css-calc': 2.1.4(@csstools/css-parser-algorithms@3.0.5(@csstools/css-tokenizer@3.0.4))(@csstools/css-tokenizer@3.0.4)
+      '@csstools/css-color-parser': 3.0.10(@csstools/css-parser-algorithms@3.0.5(@csstools/css-tokenizer@3.0.4))(@csstools/css-tokenizer@3.0.4)
+      '@csstools/css-parser-algorithms': 3.0.5(@csstools/css-tokenizer@3.0.4)
+      '@csstools/css-tokenizer': 3.0.4
+      lru-cache: 10.4.3
+
+  '@csstools/color-helpers@5.0.2': {}
+
+  '@csstools/css-calc@2.1.4(@csstools/css-parser-algorithms@3.0.5(@csstools/css-tokenizer@3.0.4))(@csstools/css-tokenizer@3.0.4)':
+    dependencies:
+      '@csstools/css-parser-algorithms': 3.0.5(@csstools/css-tokenizer@3.0.4)
+      '@csstools/css-tokenizer': 3.0.4
+
+  '@csstools/css-color-parser@3.0.10(@csstools/css-parser-algorithms@3.0.5(@csstools/css-tokenizer@3.0.4))(@csstools/css-tokenizer@3.0.4)':
+    dependencies:
+      '@csstools/color-helpers': 5.0.2
+      '@csstools/css-calc': 2.1.4(@csstools/css-parser-algorithms@3.0.5(@csstools/css-tokenizer@3.0.4))(@csstools/css-tokenizer@3.0.4)
+      '@csstools/css-parser-algorithms': 3.0.5(@csstools/css-tokenizer@3.0.4)
+      '@csstools/css-tokenizer': 3.0.4
+
+  '@csstools/css-parser-algorithms@3.0.5(@csstools/css-tokenizer@3.0.4)':
+    dependencies:
+      '@csstools/css-tokenizer': 3.0.4
+
+  '@csstools/css-tokenizer@3.0.4': {}
+
   '@esbuild/aix-ppc64@0.25.8':
     optional: true
 
@@ -1997,6 +2192,9 @@ snapshots:
 
   '@types/resolve@1.20.2': {}
 
+  '@types/trusted-types@2.0.7':
+    optional: true
+
   '@typescript-eslint/eslint-plugin@8.38.0(@typescript-eslint/parser@8.38.0(eslint@9.31.0(jiti@2.4.2))(typescript@5.8.3))(eslint@9.31.0(jiti@2.4.2))(typescript@5.8.3)':
     dependencies:
       '@eslint-community/regexpp': 4.12.1
@@ -2096,6 +2294,8 @@ snapshots:
 
   acorn@8.15.0: {}
 
+  agent-base@7.1.4: {}
+
   ajv@6.12.6:
     dependencies:
       fast-deep-equal: 3.1.3
@@ -2163,10 +2363,22 @@ snapshots:
 
   cssesc@3.0.0: {}
 
+  cssstyle@4.6.0:
+    dependencies:
+      '@asamuzakjp/css-color': 3.2.0
+      rrweb-cssom: 0.8.0
+
+  data-urls@5.0.0:
+    dependencies:
+      whatwg-mimetype: 4.0.0
+      whatwg-url: 14.2.0
+
   debug@4.4.1:
     dependencies:
       ms: 2.1.3
 
+  decimal.js@10.6.0: {}
+
   deep-is@0.1.4: {}
 
   deepmerge@4.3.1: {}
@@ -2175,6 +2387,10 @@ snapshots:
 
   devalue@5.1.1: {}
 
+  dompurify@3.2.6:
+    optionalDependencies:
+      '@types/trusted-types': 2.0.7
+
   enhanced-resolve@5.18.2:
     dependencies:
       graceful-fs: 4.2.11
@@ -2182,6 +2398,8 @@ snapshots:
 
   entities@4.5.0: {}
 
+  entities@6.0.1: {}
+
   esbuild@0.25.8:
     optionalDependencies:
       '@esbuild/aix-ppc64': 0.25.8
@@ -2381,6 +2599,28 @@ snapshots:
     dependencies:
       function-bind: 1.1.2
 
+  html-encoding-sniffer@4.0.0:
+    dependencies:
+      whatwg-encoding: 3.1.1
+
+  http-proxy-agent@7.0.2:
+    dependencies:
+      agent-base: 7.1.4
+      debug: 4.4.1
+    transitivePeerDependencies:
+      - supports-color
+
+  https-proxy-agent@7.0.6:
+    dependencies:
+      agent-base: 7.1.4
+      debug: 4.4.1
+    transitivePeerDependencies:
+      - supports-color
+
+  iconv-lite@0.6.3:
+    dependencies:
+      safer-buffer: 2.1.2
+
   ignore@5.3.2: {}
 
   ignore@7.0.5: {}
@@ -2406,6 +2646,8 @@ snapshots:
 
   is-number@7.0.0: {}
 
+  is-potential-custom-element-name@1.0.1: {}
+
   is-reference@1.2.1:
     dependencies:
       '@types/estree': 1.0.8
@@ -2416,12 +2658,49 @@ snapshots:
 
   isexe@2.0.0: {}
 
+  isomorphic-dompurify@2.26.0:
+    dependencies:
+      dompurify: 3.2.6
+      jsdom: 26.1.0
+    transitivePeerDependencies:
+      - bufferutil
+      - canvas
+      - supports-color
+      - utf-8-validate
+
   jiti@2.4.2: {}
 
   js-yaml@4.1.0:
     dependencies:
       argparse: 2.0.1
 
+  jsdom@26.1.0:
+    dependencies:
+      cssstyle: 4.6.0
+      data-urls: 5.0.0
+      decimal.js: 10.6.0
+      html-encoding-sniffer: 4.0.0
+      http-proxy-agent: 7.0.2
+      https-proxy-agent: 7.0.6
+      is-potential-custom-element-name: 1.0.1
+      nwsapi: 2.2.20
+      parse5: 7.3.0
+      rrweb-cssom: 0.8.0
+      saxes: 6.0.0
+      symbol-tree: 3.2.4
+      tough-cookie: 5.1.2
+      w3c-xmlserializer: 5.0.0
+      webidl-conversions: 7.0.0
+      whatwg-encoding: 3.1.1
+      whatwg-mimetype: 4.0.0
+      whatwg-url: 14.2.0
+      ws: 8.18.3
+      xml-name-validator: 5.0.0
+    transitivePeerDependencies:
+      - bufferutil
+      - supports-color
+      - utf-8-validate
+
   json-buffer@3.0.1: {}
 
   json-schema-traverse@0.4.1: {}
@@ -2504,6 +2783,8 @@ snapshots:
 
   lodash.merge@4.6.2: {}
 
+  lru-cache@10.4.3: {}
+
   magic-string@0.30.17:
     dependencies:
       '@jridgewell/sourcemap-codec': 1.5.4
@@ -2552,6 +2833,8 @@ snapshots:
 
   natural-compare@1.4.0: {}
 
+  nwsapi@2.2.20: {}
+
   optionator@0.9.4:
     dependencies:
       deep-is: 0.1.4
@@ -2573,6 +2856,10 @@ snapshots:
     dependencies:
       callsites: 3.1.0
 
+  parse5@7.3.0:
+    dependencies:
+      entities: 6.0.1
+
   path-exists@4.0.0: {}
 
   path-key@3.1.1: {}
@@ -2675,6 +2962,8 @@ snapshots:
       '@rollup/rollup-win32-x64-msvc': 4.45.1
       fsevents: 2.3.3
 
+  rrweb-cssom@0.8.0: {}
+
   run-parallel@1.2.0:
     dependencies:
       queue-microtask: 1.2.3
@@ -2683,6 +2972,12 @@ snapshots:
     dependencies:
       mri: 1.2.0
 
+  safer-buffer@2.1.2: {}
+
+  saxes@6.0.0:
+    dependencies:
+      xmlchars: 2.2.0
+
   semver@7.7.2: {}
 
   set-cookie-parser@2.7.1: {}
@@ -2749,6 +3044,8 @@ snapshots:
       magic-string: 0.30.17
       zimmerframe: 1.1.2
 
+  symbol-tree@3.2.4: {}
+
   tailwindcss@4.1.11: {}
 
   tapable@2.2.2: {}
@@ -2767,12 +3064,26 @@ snapshots:
       fdir: 6.4.6(picomatch@4.0.3)
       picomatch: 4.0.3
 
+  tldts-core@6.1.86: {}
+
+  tldts@6.1.86:
+    dependencies:
+      tldts-core: 6.1.86
+
   to-regex-range@5.0.1:
     dependencies:
       is-number: 7.0.0
 
   totalist@3.0.1: {}
 
+  tough-cookie@5.1.2:
+    dependencies:
+      tldts: 6.1.86
+
+  tr46@5.1.1:
+    dependencies:
+      punycode: 2.3.1
+
   ts-api-utils@2.1.0(typescript@5.8.3):
     dependencies:
       typescript: 5.8.3
@@ -2819,12 +3130,35 @@ snapshots:
     optionalDependencies:
       vite: 7.0.5(jiti@2.4.2)(lightningcss@1.30.1)
 
+  w3c-xmlserializer@5.0.0:
+    dependencies:
+      xml-name-validator: 5.0.0
+
+  webidl-conversions@7.0.0: {}
+
+  whatwg-encoding@3.1.1:
+    dependencies:
+      iconv-lite: 0.6.3
+
+  whatwg-mimetype@4.0.0: {}
+
+  whatwg-url@14.2.0:
+    dependencies:
+      tr46: 5.1.1
+      webidl-conversions: 7.0.0
+
   which@2.0.2:
     dependencies:
       isexe: 2.0.0
 
   word-wrap@1.2.5: {}
 
+  ws@8.18.3: {}
+
+  xml-name-validator@5.0.0: {}
+
+  xmlchars@2.2.0: {}
+
   yallist@5.0.0: {}
 
   yaml@1.10.2: {}

frontend/src/lib/common/framework/ui/SafeHtml.svelte

@@ -0,0 +1,11 @@
+<script lang="ts">
+	/* eslint-disable svelte/no-at-html-tags */
+
+	import DOMPurify from 'isomorphic-dompurify';
+
+	const { html }: { html: string } = $props();
+
+	const sanitizedHtml = $derived(DOMPurify.sanitize(html));
+</script>
+
+{@html sanitizedHtml}

frontend/src/lib/post/framework/ui/PostContentPage.svelte

@@ -3,6 +3,7 @@
 	import PostContentHeader from '$lib/post/framework/ui/PostContentHeader.svelte';
 	import { getContext, onMount } from 'svelte';
 	import markdownit from 'markdown-it';
+	import SafeHtml from '$lib/common/framework/ui/SafeHtml.svelte';
 
 	const { id }: { id: number } = $props();
 
@@ -15,12 +16,12 @@
 	onMount(() => postBloc.dispatch({ event: PostEventType.PostLoadedEvent, id: id }));
 </script>
 
-<article class="prose container pb-10">
+<article class="container prose pb-10">
 	{#if state.data}
 		<PostContentHeader postInfo={state.data.info} />
 		<div class="max-w-3xl">
 			<hr />
-			{@html parsedContent}
+			<SafeHtml html={parsedContent} />
 		</div>
 	{/if}
 </article>

frontend/src/routes/+error.svelte

@@ -16,4 +16,3 @@
 		</h2>
 	</div>
 </div>
-<div>{page.error?.message}</div>