{"id":"GHSA-2rwj-7xq8-4gx4","summary":"Qwik has a potential mXSS vulnerability due to improper HTML escaping","details":"### Summary\n\nA potential mXSS vulnerability exists in Qwik for versions up to 1.6.0.\n\n### Details\n\nQwik improperly escapes HTML on server-side rendering. It converts strings according to the following rules:\n\nhttps://github.com/QwikDev/qwik/blob/v1.5.5/packages/qwik/src/core/render/ssr/render-ssr.ts#L1182-L1208\n\n- If the string is an attribute value:\n    - `\"` -\u003e `"`\n    - `&` -\u003e `&`\n    - Other characters -\u003e No conversion\n- Otherwise:\n    - `\u003c` -\u003e `<`\n    - `\u003e` -\u003e `>`\n    - `&` -\u003e `&`\n    - Other characters -\u003e No conversion\n\nIt sometimes causes the situation that the final DOM tree rendered on browsers is different from what Qwik expects on server-side rendering. This may be leveraged to perform XSS attacks, and a type of the XSS is known as mXSS (mutation XSS).\n\n## PoC\n\nA vulnerable component:\n```javascript\nimport { component$ } from \"@builder.io/qwik\";\nimport { useLocation } from \"@builder.io/qwik-city\";\n\nexport default component$(() =\u003e {\n  \n  // user input\n  const { url } = useLocation();\n  const href = url.searchParams.get(\"href\") ?? \"https://example.com\";\n\n  return (\n    \u003cdiv\u003e\n      \u003cnoscript\u003e\n        \u003ca href={href}\u003etest\u003c/a\u003e\n      \u003c/noscript\u003e\n    \u003c/div\u003e\n  );\n});\n```\n\nIf a user accesses the following URL,\n```\nhttp://localhost:4173/?href=\u003c/noscript\u003e\u003cscript\u003ealert(123)\u003c/script\u003e\n```\nthen, `alert(123)` will be executed.\n\n### Impact\n\nXSS","aliases":["CVE-2024-41677"],"modified":"2024-08-06T18:55:31Z","published":"2024-08-06T18:24:47Z","database_specific":{"nvd_published_at":"2024-08-06T18:15:56Z","cwe_ids":["CWE-79"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2024-08-06T18:24:47Z"},"references":[{"type":"WEB","url":"https://github.com/QwikDev/qwik/security/advisories/GHSA-2rwj-7xq8-4gx4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-41677"},{"type":"WEB","url":"https://github.com/QwikDev/qwik/commit/7e742eb3a1001542d795776c0317d47df8b9d64e"},{"type":"PACKAGE","url":"https://github.com/QwikDev/qwik"},{"type":"WEB","url":"https://github.com/QwikDev/qwik/blob/v1.5.5/packages/qwik/src/core/render/ssr/render-ssr.ts#L1182-L1208"}],"affected":[{"package":{"name":"@builder.io/qwik","ecosystem":"npm","purl":"pkg:npm/%40builder.io/qwik"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.7.3"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/08/GHSA-2rwj-7xq8-4gx4/GHSA-2rwj-7xq8-4gx4.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L"},{"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"}]}