CVE-2026-94613authentik: Denial of Service via Document Type Declarations in SAML Messages
Updated under an hour ago ()
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Sep 29, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
goauthentik authentik goauthentik:authentik (from the name) | before 2026.2.7; from 2026.5.0, < 2026.5.7; from 2026.8.0, < 2026.8.2 | CNA record |
References
- https://github.com/goauthentik/authentik/security/advisories/GHSA-cxwx-9x59-28qmx-refsource-confirm
- https://github.com/goauthentik/authentik/pull/25959x-refsource-misc
- https://github.com/goauthentik/authentik/pull/25964x-refsource-misc
- https://github.com/goauthentik/authentik/pull/25969x-refsource-misc
- https://github.com/goauthentik/authentik/pull/25974x-refsource-misc
- https://github.com/goauthentik/authentik/commit/03d19d63b8d8dd7bc3de7cf6e57c6df341a9fc86x-refsource-misc
- https://github.com/goauthentik/authentik/commit/4cf2f803b1c2ef38c224eead375fd057a10ee8acx-refsource-misc
- https://github.com/goauthentik/authentik/commit/732adad26bb97361b6bf25ef138df5c16471ba1fx-refsource-misc
- https://github.com/goauthentik/authentik/commit/a029f5372295bfeb1e334855f78601681cdc9a2dx-refsource-misc
- https://docs.goauthentik.io/releases/2026.2#fixed-in-202627x-refsource-misc
- https://docs.goauthentik.io/releases/2026.5#fixed-in-202657x-refsource-misc
- https://docs.goauthentik.io/releases/2026.8#fixed-in-202682x-refsource-misc
- https://github.com/goauthentik/authentik/releases/tag/version/2026.2.7x-refsource-misc
- https://github.com/goauthentik/authentik/releases/tag/version/2026.5.7x-refsource-misc
- https://github.com/goauthentik/authentik/releases/tag/version/2026.8.2x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.