{"id":"CVE-2026-49215","aliases":["GHSA-4m4j-hmqq-3gxm"],"url":"https://o3.security/vulnerability/CVE-2026-49215","summary":"Symfony UX: CSRF Protection Bypass in symfony/ux-live-component — Accept Header is CORS-Safelisted","details":"Symfony UX is a JavaScript ecosystem for Symfony. From 2.22.0 until 2.36.0 and 3.1.0, Symfony\\UX\\LiveComponent\\EventListener\\LiveComponentSubscriber::isLiveComponentRequest() gates #[LiveAction] invocations on Accept: application/vnd.live-component+html, but the Accept header is CORS-safelisted and cross-origin fetch() can set it without preflight, allowing forged cross-origin #[LiveAction] requests against a victim session when applications use SameSite=None, credentials: 'include', a permissive cookie policy, or a same-origin pivot. This issue is fixed in versions 2.36.0 and 3.1.0.","published":"2026-07-17T16:16:42.126Z","modified":"2026-08-12T03:51:13.436631423Z","cvss":null,"epss":{"score":0.00177,"percentile":0.0748,"asOf":"2026-09-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"symfony/ux-live-component","fixedVersion":"2.36.0"},{"ecosystem":"Packagist","name":"symfony/ux-live-component","fixedVersion":"3.1.0"}],"fix":{"url":"https://github.com/symfony/ux/commit/aed7493db2b4b7bf1f9c79b33cda544f06904b27","label":"symfony/ux@aed7493"},"references":[{"type":"WEB","url":"https://github.com/symfony/ux/releases/tag/v2.36.0"},{"type":"WEB","url":"https://github.com/symfony/ux/releases/tag/v3.1.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49215.json"},{"type":"ADVISORY","url":"https://github.com/symfony/ux/security/advisories/GHSA-4m4j-hmqq-3gxm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49215"},{"type":"FIX","url":"https://github.com/symfony/ux/commit/aed7493db2b4b7bf1f9c79b33cda544f06904b27"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:13.436631423Z"}}