Publish GHSA-8266-84wp-wv5c

2026-05-22 18:04:22 -07:00 · 2024-08-30 16:50:33 +00:00
parent d9a1b512bf
commit 2877720c16
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+{
+  "schema_version": "1.4.0",
+  "id": "GHSA-8266-84wp-wv5c",
+  "modified": "2024-08-30T16:49:10Z",
+  "published": "2024-08-30T16:49:10Z",
+  "aliases": [
+    "CVE-2024-45047"
+  ],
+  "summary": "Svelte has a potential mXSS vulnerability due to improper HTML escaping",
+  "details": "### Summary\n\nA potential XSS vulnerability exists in Svelte for versions prior to 4.2.19.\n\n### Details\n\nSvelte improperly escapes HTML on server-side rendering. It converts strings according to the following rules:\n\n- If the string is an attribute value:\n    - `\"` -> `&quot;`\n    - `&` -> `&amp;`\n    - Other characters -> No conversion\n- Otherwise:\n    - `<` -> `&lt;`\n    - `&` -> `&amp;`\n    - Other characters -> No conversion\n\nThe assumption is that attributes will always stay as such, but in some situation the final DOM tree rendered on browsers is different from what Svelte expects on server-side rendering. This may be leveraged to perform XSS attacks. More specifically, this can occur when injecting malicious content into an attribute within a `<noscript>` tag.\n\n### PoC\n\nA vulnerable page (`+page.svelte`):\n```html\n<script>\nimport { page } from \"$app/stores\"\n\n// user input\nlet href = $page.url.searchParams.get(\"href\") ?? \"https://example.com\";\n</script>\n\n<noscript>\n  <a href={href}>test</a>\n</noscript>\n```\n\nIf a user accesses the following URL,\n```\nhttp://localhost:4173/?href=</noscript><script>alert(123)</script>\n```\nthen, `alert(123)` will be executed.\n\n### Impact\n\nXSS, when using an attribute within a noscript tag",
+  "severity": [
+    {
+      "type": "CVSS_V3",
+      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"
+    },
+    {
+      "type": "CVSS_V4",
+      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"
+    }
+  ],
+  "affected": [
+    {
+      "package": {
+        "ecosystem": "npm",
+        "name": "svelte"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "0"
+            },
+            {
+              "fixed": "4.2.19"
+            }
+          ]
+        }
+      ]
+    }
+  ],
+  "references": [
+    {
+      "type": "WEB",
+      "url": "https://github.com/sveltejs/svelte/security/advisories/GHSA-8266-84wp-wv5c"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/sveltejs/svelte/commit/83e96e044deb5ecbae2af361ae9e31d3e1ac43a3"
+    },
+    {
+      "type": "PACKAGE",
+      "url": "https://github.com/sveltejs/svelte"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-79"
+    ],
+    "severity": "MODERATE",
+    "github_reviewed": true,
+    "github_reviewed_at": "2024-08-30T16:49:10Z",
+    "nvd_published_at": null
+  }
+}