goauthentik Authentik up to 2026.2.6/2026.5.6/2026.8.1 SAML Source authentication replay

Summaryinfo

A vulnerability marked as critical has been reported in goauthentik Authentik up to 2026.2.6/2026.5.6/2026.8.1. Impacted is an unknown function of the component SAML Source. Performing a manipulation results in authentication replay. This vulnerability was named CVE-2026-94612. The attack may be initiated remotely. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in goauthentik Authentik up to 2026.2.6/2026.5.6/2026.8.1. It has been classified as critical. This affects an unknown code of the component SAML Source. The manipulation with an unknown input leads to a authentication replay vulnerability. CWE is classifying the issue as CWE-294. A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-94612 since 09/21/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1040 according to MITRE ATT&CK.

Upgrading to version 2026.2.7, 2026.5.7 or 2026.8.2 eliminates this vulnerability.

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Productinfo

Vendor

• goauthentik

Name

• Authentik

Version

• 2026.2.0
• 2026.2.1
• 2026.2.2
• 2026.2.3
• 2026.2.4
• 2026.2.5
• 2026.2.6
• 2026.5.0
• 2026.5.1
• 2026.5.2
• 2026.5.3
• 2026.5.4
• 2026.5.5
• 2026.5.6
• 2026.8.0
• 2026.8.1

Website

• Product: https://github.com/goauthentik/authentik/

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