Input validation error in authentik - CVE-2026-41569
Published: May 12, 2026
Vulnerability identifier: #VU131246
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-41569
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive authentication information.
The vulnerability exists due to improper input validation in the WS-Federation provider when processing a user-supplied wreply parameter. A remote attacker can craft a login link with an attacker-controlled wreply value to disclose sensitive authentication information.
Only WS-Federation providers with a prefix-ambiguous Reply URL are affected, and the victim's browser must follow the crafted login link.
Affected software
authentik
How to mitigate CVE-2026-41569
Install security update from vendor's website.
authentik - update to 2026.2.3