{"id":"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.","aliases":["GHSA-4m4j-hmqq-3gxm"],"modified":"2026-08-12T03:51:13.436631423Z","published":"2026-07-17T16:16:42.126Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49215.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-352"]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/symfony/ux","events":[{"introduced":"fd7609f5c514350261bf8431c9b09533c89040f1"},{"fixed":"5ccec9746faa28d79a87138042174c3853d5702b"},{"introduced":"3cef8e0d9557bbde60c3f1bfd2cbb1004af7fc9a"},{"fixed":"aed7493db2b4b7bf1f9c79b33cda544f06904b27"},{"fixed":"4c883fdb0f0e7ea577f851bd457024f7e88788c9"}],"database_specific":{"source":["CPE_RANGE","CPE_STRING","REFERENCES"],"cpe":["cpe:2.3:a:symfony:ux:*:*:*:*:*:*:*:*","cpe:2.3:a:symfony:ux:3.0.0:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"2.22.0"},{"fixed":"2.36.0"},{"introduced":"3.0.0"},{"last_affected":"3.0.0"}]}}],"versions":["3.0.0","v2.35.0","v3.0.0","v2.34.0","v2.33.0","v2.32.0","v2.31.0","v2.30.0","v2.29.2","v2.29.1","v2.29.0","v2.28.2","v2.28.1","v2.28.0","v2.27.0","v2.26.0","v2.26.1","v2.25.2","v2.25.1","v2.25.0","v2.24.0","v2.23.0","v2.22.1","v2.22.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49215.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"}]}