Vulnerability details

authentik is an open-source identity provider. Prior to 2026.2.7, 2026.5.7, and 2026.8.2, an unauthenticated attacker can submit a malformed SAML message to an authentik deployment using SAML in either the identity-provider or SAML source role. The message can stop the worker handling /application/saml/* or /source/saml/*, causing the requests assigned to that worker to fail. Worker process termination and automatic restart do not destroy database-backed sessions, but continued malicious messages can cause a sustained share of legitimate traffic to fail. Other protocol implementations are not affected. This issue is fixed in versions 2026.2.7, 2026.5.7, and 2026.8.2.

• https://github.com/goauthentik/authentik/security/advisories/GHSA-cxwx-9x59-28qm x_refsource_CONFIRM
• https://github.com/goauthentik/authentik/pull/25959 x_refsource_MISC
• https://github.com/goauthentik/authentik/pull/25964 x_refsource_MISC
• https://github.com/goauthentik/authentik/pull/25969 x_refsource_MISC
• https://github.com/goauthentik/authentik/pull/25974 x_refsource_MISC
• https://github.com/goauthentik/authentik/commit/03d19d63b8d8dd7bc3de7cf6e57c6df341a9fc86 x_refsource_MISC
• https://github.com/goauthentik/authentik/commit/4cf2f803b1c2ef38c224eead375fd057a10ee8ac x_refsource_MISC
• https://github.com/goauthentik/authentik/commit/732adad26bb97361b6bf25ef138df5c16471ba1f x_refsource_MISC
• https://github.com/goauthentik/authentik/commit/a029f5372295bfeb1e334855f78601681cdc9a2d x_refsource_MISC
• https://docs.goauthentik.io/releases/2026.2#fixed-in-202627 x_refsource_MISC
• https://docs.goauthentik.io/releases/2026.5#fixed-in-202657 x_refsource_MISC
• https://docs.goauthentik.io/releases/2026.8#fixed-in-202682 x_refsource_MISC
• https://github.com/goauthentik/authentik/releases/tag/version/2026.2.7 x_refsource_MISC
• https://github.com/goauthentik/authentik/releases/tag/version/2026.5.7 x_refsource_MISC
• https://github.com/goauthentik/authentik/releases/tag/version/2026.8.2 x_refsource_MISC