{"id":"CVE-2026-34749","aliases":["GHSA-p6mr-xf3r-ghq4"],"url":"https://o3.security/vulnerability/CVE-2026-34749","summary":"Payload has a CSRF Protection Bypass in Authentication Flow","details":"### Impact\n\nA Cross-Site Request Forgery (CSRF) vulnerability existed in the authentication flow. Under certain conditions, the configured CSRF protection could be bypassed, allowing cross-site requests to be made.\n\nConsumers are affected if ALL of these are true:\n\n- Payload version **< v3.79.1**\n- `serverURL` is configured\n\n### Patches\n\nThis vulnerability has been patched in **v3.79.1**. Additional validation has been added to the authentication flow.\n\nConsumers should upgrade to **v3.79.1** or later.\n\n### Workarounds\n\nThere is no complete workaround without upgrading. \n\nIf consumers cannot upgrade immediately, setting `cookies.sameSite` to `'Strict'` will prevent the session cookie from being sent cross-site. However, this will also require users to re-authenticate when navigating to the application from external links (e.g. email, other sites).","published":"2026-04-01T19:49:35.934Z","modified":"2026-10-28T02:30:41.408500494Z","cvss":{"score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L"},"epss":{"score":0.00129,"percentile":0.02962,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"payload","fixedVersion":"3.79.1"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/payloadcms/payload/releases/tag/v3.79.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34749.json"},{"type":"ADVISORY","url":"https://github.com/payloadcms/payload/security/advisories/GHSA-p6mr-xf3r-ghq4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34749"},{"type":"PACKAGE","url":"https://github.com/payloadcms/payload"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:41.408500494Z"}}