{"id":"GHSA-jmv2-qgxf-f995","summary":"Astro: Reflected XSS via unescaped slot names in @astrojs/solid-js","details":"## Summary\n\nThe `@astrojs/solid-js` renderer wraps named slot content passed to Solid components in an `\u003castro-slot\u003e` element, and writes the slot name into its `name` attribute without HTML escaping. A slot name containing `\"` could end the attribute and inject arbitrary HTML into the page.\n\nFor example, a page that takes a slot name from the request:\n\n```astro\n---\nimport Tabs from '../components/Tabs.jsx';\nconst tab = Astro.url.searchParams.get('tab');\n---\n\u003cTabs client:load active={tab}\u003e\u003cdiv slot={tab}\u003e…\u003c/div\u003e\u003c/Tabs\u003e\n```\n\nrendered with a Solid component that renders a slot by name:\n\n```jsx\nexport default function Tabs(props) {\n\treturn \u003cdiv\u003e{props[props.active]}\u003c/div\u003e;\n}\n```\n\nwould output a `tab` value such as `x\"\u003e\u003cimg src=x onerror=alert(1)\u003e` as live HTML.\n\n## Impact\n\nReflected cross-site scripting. An attacker who gets a user to open a crafted link can run JavaScript on the site's origin, but only in applications where all of the following are true:\n\n- The page passes request-controlled input (such as a query parameter) as a slot name.\n- The Solid component is hydrated with a `client:*` directive. For non-hydrated components the slot wrapper is removed from the output, together with its `name` attribute.\n- The Solid component renders the attacker-chosen slot, which in practice means accessing slot props by a dynamic name. Components that never render the slot only output Astro's already escaped fallback template.\n\nThis is the `@astrojs/solid-js` counterpart of GHSA-8hv8-536x-4wqp (CVE-2026-50146), which fixed the same issue in `astro` core.\n\n## Affected versions\n\n`@astrojs/solid-js` \u003e= 0.2.0, \u003c= 7.1.1.\n\n## Patches\n\nFixed in `@astrojs/solid-js` 7.1.2. Slot names are now HTML-escaped in the server renderer.\n\n## Workarounds\n\nUpgrade to `@astrojs/solid-js` 7.1.2 or later. Before upgrading, do not use request-controlled input as a slot name, or map it to a fixed set of known slot names before passing it to a component.\n\n## Credits\n\nReported by @manus-pi.","aliases":["CVE-2026-126363"],"modified":"2026-11-12T22:45:04.210591300Z","published":"2026-11-12T22:34:44Z","database_specific":{"nvd_published_at":null,"cwe_ids":["CWE-79"],"severity":"LOW","github_reviewed":true,"github_reviewed_at":"2026-11-12T22:34:44Z"},"references":[{"type":"WEB","url":"https://github.com/withastro/astro/security/advisories/GHSA-jmv2-qgxf-f995"},{"type":"WEB","url":"https://github.com/withastro/astro/commit/290b196ddb48de11783ff128e2b7272c61490a20"},{"type":"PACKAGE","url":"https://github.com/withastro/astro"},{"type":"WEB","url":"https://github.com/withastro/astro/releases/tag/@astrojs/solid-js@7.1.2"}],"affected":[{"package":{"name":"@astrojs/solid-js","ecosystem":"npm","purl":"pkg:npm/%40astrojs/solid-js"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.2.0"},{"fixed":"7.1.2"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 7.1.1","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/11/GHSA-jmv2-qgxf-f995/GHSA-jmv2-qgxf-f995.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N"}]}