{"id":"CVE-2025-32388","aliases":["EUVD-2025-11140","GHSA-6q87-84jw-cjhp"],"status":"published","title":"SvelteKit allows XSS via tracked search_params","description":"SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.20.6 , unsanitized search param names cause XSS vulnerability. You are affected if you iterate over all entries of event.url.searchParams inside a server load function. Attackers can exploit it by crafting a malicious URL and getting a user to click a link with said URL. This vulnerability is fixed in 2.20.6.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.0031,"percentile":0.24141,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2025-04-14T19:10:42Z","modified":"2026-10-28T02:30:36Z","fixes":[{"ecosystem":"npm","package":"@sveltejs/kit","fixed_in":["2.20.6"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@sveltejs/kit","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.0.0"},{"fixed":"2.20.6"}]}]},{"source":"osv","ecosystem":"npm","package":"@sveltejs/kit","ranges":[{"type":"SEMVER","events":[{"introduced":"2.0.0"},{"fixed":"2.20.6"}]}]}],"products":[{"vendor":"sveltejs","product":"kit"}],"references":[{"url":"https://github.com/sveltejs/kit/security/advisories/GHSA-6q87-84jw-cjhp","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/sveltejs/kit/commit/d3300c6a67908590266c363dba7b0835d9a194cf","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/sveltejs/kit/releases/tag/%40sveltejs%2Fkit%402.20.6","tags":["x_refsource_MISC","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-32388","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-6q87-84jw-cjhp"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/32xxx/CVE-2025-32388.json","tags":["advisory"]},{"url":"https://github.com/sveltejs/kit","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2025-32388","title":"SvelteKit allows XSS via tracked search_params","description":"SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.20.6 , unsanitized search param names cause XSS vulnerability. You are affected if you iterate over all entries of event.url.searchParams inside a server load function. Attackers can exploit it by crafting a malicious URL and getting a user to click a link with said URL. This vulnerability is fixed in 2.20.6.","status":"published","published":"2025-04-15T22:32:06.059Z","modified":"2025-04-16T13:33:47.383Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:32:46.109993Z"}],"euvd":[{"id":"EUVD-2025-11140","description":"SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.20.6 , unsanitized search param names cause XSS vulnerability. You are affected if you iterate over all entries of event.url.searchParams inside a server load function. Attackers can exploit it by crafting a malicious URL and getting a user to click a link with said URL. This vulnerability is fixed in 2.20.6.","status":"published","published":"2025-04-15T22:32:06Z","modified":"2025-04-16T13:33:47Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T20:52:25.86191Z"}],"ghsa":[{"id":"GHSA-6q87-84jw-cjhp","title":"@sveltejs/kit vulnerable to Cross-site Scripting via tracked search_params","description":"### Summary\n\nUnsanitized search param names cause XSS vulnerability. You are affected if you iterate over all entries of `event.url.searchParams` inside a server `load` function. Attackers can exploit it by crafting a malicious URL and getting a user to click a link with said URL.\n\n### Details\n\nSvelteKit tracks which parameters in `event.url.searchParams` are read inside server `load` functions. If the application iterates over the these parameters, the `uses.search_params` array included in the boot script (embedded in the server-rendered HTML) will have any search param name included in unsanitized form.\n\n`packages/kit/src/runtime/server/utils.js:150` has the `stringify_uses(node)` function which prints these out.\n\n### Reproduction\n\nIn a `+page.server.js` or `+layout.server.js`:\n\n```js\n/** @type {import('@sveltejs/kit').Load} */\nexport function load(event) {\n  const values = {};\n\n  for (const key of event.url.searchParams.keys()) {\n    values[key] = event.url.searchParams.get(key);\n  }\n}\n```\n\nIf a user visits the page in question via a link containing `?\u003c/script/\u003e\u003cscript\u003ewindow.pwned%3D1\u003c/script/\u003e`, the `\u003c/script\u003e` will be included verbatim in the payload, causing the embedded script to be executed.\n\nIt is not necessary to return the parameter value from `load` or render it in the page, only to read it (which causes it to be tracked as a dependency) while `load` is running.\n\n### Impact\n\nAny application that iterates over all values in `event.url.searchParams` in a `load` function in `+page.server.js` or `+layout.server.js` (directly or indirectly) is vulnerable to XSS.","status":"published","published":"2025-04-14T19:10:42Z","modified":"2026-10-18T15:04:06Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:41:32.483482Z"}],"nvd":[{"id":"CVE-2025-32388","description":"SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.20.6 , unsanitized search param names cause XSS vulnerability. You are affected if you iterate over all entries of event.url.searchParams inside a server load function. Attackers can exploit it by crafting a malicious URL and getting a user to click a link with said URL. This vulnerability is fixed in 2.20.6.","status":"published","published":"2025-04-15T23:15:42.843Z","modified":"2026-06-17T09:11:55.317Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:11:00.456643Z"}],"osv":[{"id":"CVE-2025-32388","title":"SvelteKit allows XSS via tracked search_params","description":"SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.20.6 , unsanitized search param names cause XSS vulnerability. You are affected if you iterate over all entries of event.url.searchParams inside a server load function. Attackers can exploit it by crafting a malicious URL and getting a user to click a link with said URL. This vulnerability is fixed in 2.20.6.","status":"published","published":"2025-04-15T22:32:06.059Z","modified":"2026-10-28T02:30:36.066798291Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:44:48.02508Z"},{"id":"GHSA-6q87-84jw-cjhp","title":"@sveltejs/kit vulnerable to Cross-site Scripting via tracked search_params","description":"### Summary\n\nUnsanitized search param names cause XSS vulnerability. You are affected if you iterate over all entries of `event.url.searchParams` inside a server `load` function. Attackers can exploit it by crafting a malicious URL and getting a user to click a link with said URL.\n\n### Details\n\nSvelteKit tracks which parameters in `event.url.searchParams` are read inside server `load` functions. If the application iterates over the these parameters, the `uses.search_params` array included in the boot script (embedded in the server-rendered HTML) will have any search param name included in unsanitized form.\n\n`packages/kit/src/runtime/server/utils.js:150` has the `stringify_uses(node)` function which prints these out.\n\n### Reproduction\n\nIn a `+page.server.js` or `+layout.server.js`:\n\n```js\n/** @type {import('@sveltejs/kit').Load} */\nexport function load(event) {\n  const values = {};\n\n  for (const key of event.url.searchParams.keys()) {\n    values[key] = event.url.searchParams.get(key);\n  }\n}\n```\n\nIf a user visits the page in question via a link containing `?\u003c/script/\u003e\u003cscript\u003ewindow.pwned%3D1\u003c/script/\u003e`, the `\u003c/script\u003e` will be included verbatim in the payload, causing the embedded script to be executed.\n\nIt is not necessary to return the parameter value from `load` or render it in the page, only to read it (which causes it to be tracked as a dependency) while `load` is running.\n\n### Impact\n\nAny application that iterates over all values in `event.url.searchParams` in a `load` function in `+page.server.js` or `+layout.server.js` (directly or indirectly) is vulnerable to XSS.","status":"published","published":"2025-04-14T19:10:42Z","modified":"2025-04-16T00:40:49Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:39.965326Z"}]}}