CVE-2026-94613
authentik: Denial of Service via Document Type Declarations in SAML Messages
- State
- Published
- Severity
- 7.5 High
- Published
- Sep 24, 2026
- Updated
- Sep 29, 2026
- Reserved
- Sep 21, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | GitHub_M |
Weaknesses
- CWE-770 Allocation of Resources Without Limits or Throttling
Affected Products
| Product | Versions |
|---|---|
authentikgoauthentik |
|
References
- https://github.com/goauthentik/authentik/security/advisories/GHSA-cxwx-9x59-28qm
- https://github.com/goauthentik/authentik/pull/25959
- https://github.com/goauthentik/authentik/pull/25964
- https://github.com/goauthentik/authentik/pull/25969
- https://github.com/goauthentik/authentik/pull/25974
- https://github.com/goauthentik/authentik/commit/03d19d63b8d8dd7bc3de7cf6e57c6df341a9fc86
- https://github.com/goauthentik/authentik/commit/4cf2f803b1c2ef38c224eead375fd057a10ee8ac
- https://github.com/goauthentik/authentik/commit/732adad26bb97361b6bf25ef138df5c16471ba1f
- https://github.com/goauthentik/authentik/commit/a029f5372295bfeb1e334855f78601681cdc9a2d
- https://docs.goauthentik.io/releases/2026.2#fixed-in-202627
- https://docs.goauthentik.io/releases/2026.5#fixed-in-202657
- https://docs.goauthentik.io/releases/2026.8#fixed-in-202682
- https://github.com/goauthentik/authentik/releases/tag/version/2026.2.7
- https://github.com/goauthentik/authentik/releases/tag/version/2026.5.7
- https://github.com/goauthentik/authentik/releases/tag/version/2026.8.2
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