{"id":"CVE-2024-53261","aliases":["EUVD-2024-3380","GHSA-rjjv-87mx-6x3h"],"status":"published","title":"Cross-Site Scripting attack (XSS) on dev mode 404 page in SvelteKit","description":"SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. \"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).\" The files `packages/kit/src/exports/vite/dev/index.js` and `packages/kit/src/exports/vite/utils.js` both contain user controllable data which under specific conditions may flow to dev mode pages. There is little to no expected impact. 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. None the less this issue has been addressed in version 2.8.3 and all users are advised to upgrade.","severity":{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.0035,"percentile":0.28853,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2024-11-25T15:33:19Z","modified":"2026-10-28T02:30:22Z","fixes":[{"ecosystem":"npm","package":"@sveltejs/kit","fixed_in":["2.8.3"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@sveltejs/kit","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.8.3"}]}]},{"source":"osv","ecosystem":"npm","package":"@sveltejs/kit","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.8.3"}]}]}],"products":[{"vendor":"svelte","product":"sveltekit"},{"vendor":"sveltejs","product":"kit"}],"references":[{"url":"https://github.com/sveltejs/kit/security/advisories/GHSA-rjjv-87mx-6x3h","tags":["x_refsource_CONFIRM","Third Party Advisory","advisory","web"]},{"url":"https://github.com/sveltejs/kit/commit/d338d4635a7fd947ba5112df6ee632c4a0979438","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/sveltejs/kit/pull/13039","tags":["web"]},{"url":"https://github.com/sveltejs/kit/releases/tag/%40sveltejs%2Fkit%402.8.3","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-53261","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-rjjv-87mx-6x3h"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/53xxx/CVE-2024-53261.json","tags":["advisory"]},{"url":"https://github.com/sveltejs/kit","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2024-53261","title":"Cross-Site Scripting attack (XSS) on dev mode 404 page in SvelteKit","description":"SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. \"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).\" The files `packages/kit/src/exports/vite/dev/index.js` and `packages/kit/src/exports/vite/utils.js` both contain user controllable data which under specific conditions may flow to dev mode pages. There is little to no expected impact. 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. None the less this issue has been addressed in version 2.8.3 and all users are advised to upgrade.","status":"published","published":"2024-11-25T19:15:28.233Z","modified":"2024-11-25T20:04:36.967Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","level":"low","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:34:17.865042Z"}],"euvd":[{"id":"EUVD-2024-3380","description":"SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. \"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).\" The files `packages/kit/src/exports/vite/dev/index.js` and `packages/kit/src/exports/vite/utils.js` both contain user controllable data which under specific conditions may flow to dev mode pages. There is little to no expected impact. 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. None the less this issue has been addressed in version 2.8.3 and all users are advised to upgrade.","status":"published","published":"2024-11-25T19:15:28Z","modified":"2024-11-25T20:04:36Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","level":"low"}],"updated_at":"2026-11-03T00:04:48.414867Z"}],"ghsa":[{"id":"GHSA-rjjv-87mx-6x3h","title":"@sveltejs/kit vulnerable to XSS on dev mode 404 page","description":"### 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.","status":"published","published":"2024-11-25T15:33:19Z","modified":"2025-01-22T20:54:22Z","cvss":[{"version":"3.1","score":0,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:N","level":"none"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:38:28.945236Z"}],"nvd":[{"id":"CVE-2024-53261","description":"SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. \"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).\" The files `packages/kit/src/exports/vite/dev/index.js` and `packages/kit/src/exports/vite/utils.js` both contain user controllable data which under specific conditions may flow to dev mode pages. There is little to no expected impact. 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. None the less this issue has been addressed in version 2.8.3 and all users are advised to upgrade.","status":"published","published":"2024-11-25T20:15:10.217Z","modified":"2026-06-17T08:08:42.653Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"},{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:10:38.347238Z"}],"osv":[{"id":"CVE-2024-53261","title":"Cross-Site Scripting attack (XSS) on dev mode 404 page in SvelteKit","description":"SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. \"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).\" The files `packages/kit/src/exports/vite/dev/index.js` and `packages/kit/src/exports/vite/utils.js` both contain user controllable data which under specific conditions may flow to dev mode pages. There is little to no expected impact. 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. None the less this issue has been addressed in version 2.8.3 and all users are advised to upgrade.","status":"published","published":"2024-11-25T19:15:28.233Z","modified":"2026-10-28T02:30:22.419411064Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","level":"low"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:44:44.451316Z"},{"id":"GHSA-rjjv-87mx-6x3h","title":"@sveltejs/kit vulnerable to XSS on dev mode 404 page","description":"### 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.","status":"published","published":"2024-11-25T15:33:19Z","modified":"2025-01-22T20:54:21Z","cvss":[{"version":"3.1","score":0,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:N","level":"none"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:55.877614Z"}]}}