CVE-2026-41577 authentik: SAML source does not validate Conditions, timing, or audience on assertions

Medium 6.9 Published 2 Jun 2026 Updated 3 Jun 2026

Attackers can bypass SAML authentication by replaying expired or misdirected assertions due to missing validation of timing and audience restrictions.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-41577?

CVE-2026-41577 is a medium-severity authentication bypass vulnerability in goauthentik authentik, published on 2 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

authentik is an open-source identity provider. Prior to versions 2025.12.5 and 2026.2.3, the SAML source response processor (ResponseProcessor.parse()) does not validate the Conditions element on assertions. NotBefore, NotOnOrAfter, and AudienceRestriction are all ignored. This allows replay of expired assertions and acceptance of assertions intended for other service providers. This issue has been patched in versions 2025.12.5 and 2026.2.3.

Weakness: CWE-345

Which versions are affected by CVE-2026-41577?

1 open source package ship an affected version, including authentik. It affects 1 product.

Package	Affected	Fixed in
`authentik` Bitnami	All versions	`2025.12.5, 2026.2.3`

Products include Goauthentik Authentik.

How do I fix CVE-2026-41577?

Upgrade authentik to a fixed version for your release line: 2025.12.5 or 2026.2.3.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-41577 being exploited?

There is no known exploitation of CVE-2026-41577 in the wild and no public exploit code.

Sources

Also known as BIT-authentik-2026-41577, GHSA-4v4x-x5pr-8gp2.