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.

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
goauthentik authentik affected
Version Status Constraints
< 2026.2.7 affected —
>= 2026.5.0, < 2026.5.7 affected —
>= 2026.8.0, < 2026.8.2 affected —

No data.

No data.

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Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://docs.goauthentik.io/releases/2026.2#fixed-in-202627 cve-icon cve-icon
https://docs.goauthentik.io/releases/2026.5#fixed-in-202657 cve-icon cve-icon
https://docs.goauthentik.io/releases/2026.8#fixed-in-202682 cve-icon cve-icon
https://github.com/goauthentik/authentik/commit/287ea13cdc23c378abc20a7b71c9c7919a19a89a cve-icon cve-icon
https://github.com/goauthentik/authentik/commit/355d8cc3d755fbba05fc5fa90ffbcbe6469acddd cve-icon cve-icon
https://github.com/goauthentik/authentik/commit/54fac864a0b3bc00551af1908f662b3bf5cc6135 cve-icon cve-icon
https://github.com/goauthentik/authentik/commit/984b0162711f0d1988ed33544d0a671c93e4ec76 cve-icon cve-icon
https://github.com/goauthentik/authentik/pull/25957 cve-icon cve-icon
https://github.com/goauthentik/authentik/pull/25962 cve-icon cve-icon
https://github.com/goauthentik/authentik/pull/25967 cve-icon cve-icon
https://github.com/goauthentik/authentik/pull/25972 cve-icon cve-icon
https://github.com/goauthentik/authentik/releases/tag/version/2026.2.7 cve-icon cve-icon
https://github.com/goauthentik/authentik/releases/tag/version/2026.5.7 cve-icon cve-icon
https://github.com/goauthentik/authentik/releases/tag/version/2026.8.2 cve-icon cve-icon
https://github.com/goauthentik/authentik/security/advisories/GHSA-cqj8-fxxf-9pg7 cve-icon cve-icon
History

Thu, 24 Sep 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Thu, 24 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
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.
Title authentik: Authentication bypass via assertion confusion in SAML sources
Weaknesses CWE-287
CWE-345
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-09-24T17:15:23.385Z

Reserved: 2026-09-21T21:32:23.741Z

Link: CVE-2026-94612

cve-icon Vulnrichment

Updated: 2026-09-24T17:15:20.358Z

cve-icon NVD

Status : Deferred

Published: 2026-09-24T17:17:17.557

Modified: 2026-09-24T19:39:45.600

Link: CVE-2026-94612

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses