CVE-2026-80200: Kimai before 2.53.0 Open Redirect via RelayState

Severity: medium (CVSS 4.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-26 · updated 2026-10-08
Weakness: CWE-601

Description

Kimai before 2.53.0 contains an open redirect vulnerability in the SAML authentication success handler that accepts unvalidated RelayState POST parameters as redirect destinations. Attackers with IdP access can supply malicious RelayState values to redirect authenticated users to attacker-controlled URLs for credential theft or phishing attacks.

Affected products

kimai: before 2.53.0 — fixed in 2.53.0

How to fix

Upgrade to a fixed version: kimai 2.53.0. Check the vendor advisory for mitigations.

References

https://github.com/kimai/kimai/security/advisories/GHSA-3jp4-mhh4-gcgr
https://www.vulncheck.com/advisories/kimai-before-2.53.0-open-redirect-via-relaystate

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