Description
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.
References10
- docs.goauthentik.io/releases/2026.2#fixed-in-202627
- docs.goauthentik.io/releases/2026.5#fixed-in-202657
- docs.goauthentik.io/releases/2026.8#fixed-in-202682
- github.com/goauthentik/authentik/commit/03d19d63b8d8dd7bc3de7cf…
- github.com/goauthentik/authentik/commit/4cf2f803b1c2ef38c224eea…
- github.com/goauthentik/authentik/commit/732adad26bb97361b6bf25e…
- github.com/goauthentik/authentik/commit/a029f5372295bfeb1e33485…
- github.com/goauthentik/authentik/pull/25959
- github.com/goauthentik/authentik/pull/25964
- github.com/goauthentik/authentik/pull/25969
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 1% percentile: 51 · as of 9 November 2026
- CWE
- CWE-770
Could this be exploited in your environment?
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