{"id":"CVE-2024-53261","aliases":["GHSA-rjjv-87mx-6x3h"],"url":"https://o3.security/vulnerability/CVE-2024-53261","summary":"Cross-Site Scripting attack (XSS) on dev mode 404 page in SvelteKit","details":"### Summary\n\n\"Unsanitized input from *the request URL* flows into `end`, where it is used to render an HTML page returned to the user. This may result in a Cross-Site Scripting attack (XSS).\"\n\n### Details\n\nSource of potentially tainted data is in `packages/kit/src/exports/vite/dev/index.js`, line 437. This potentially tainted data is passed through a number of steps (which I could detail if you'd like) all the way down to line 91 in `packages/kit/src/exports/vite/utils.js`, which performs an operation that Snyk believes an attacker shouldn't be allowed to manipulate.\n\nAnother source of potentially tainted data (according to Snyk) comes from `‎packages/kit/src/exports/vite/utils.js`, line 30, col 30 (i.e., the `url` property of `req`). This potentially tainted data is passed through a number of steps (which I could detail if you'd like) all the way down line 91 in `packages/kit/src/exports/vite/utils.js`, which performs an operation that Snyk believes an attacker shouldn't be allowed to manipulate.\n\n### PoC\n\nNot provided\n\n### Impact\n\nLittle to none. The Vite development is not exposed to the network by default. And even if someone were able to trick a developer into executing an XSS against themselves, a development database should not have any sensitive data.","published":"2024-11-25T19:15:28.233Z","modified":"2026-08-12T03:51:20.522052974Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"@sveltejs/kit","fixedVersion":"2.8.3"}],"fix":{"url":"https://github.com/sveltejs/kit/commit/d338d4635a7fd947ba5112df6ee632c4a0979438","label":"sveltejs/kit@d338d46"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/53xxx/CVE-2024-53261.json"},{"type":"ADVISORY","url":"https://github.com/sveltejs/kit/security/advisories/GHSA-rjjv-87mx-6x3h"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-53261"},{"type":"FIX","url":"https://github.com/sveltejs/kit/commit/d338d4635a7fd947ba5112df6ee632c4a0979438"},{"type":"WEB","url":"https://github.com/sveltejs/kit/pull/13039"},{"type":"PACKAGE","url":"https://github.com/sveltejs/kit"},{"type":"WEB","url":"https://github.com/sveltejs/kit/releases/tag/%40sveltejs%2Fkit%402.8.3"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:20.522052974Z"}}