Vulnerability · Published Aug 25, 2026 · Assigned by VulnCheck

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

Medium 4.7

In plain English

A medium-severity open redirect in kimai from kimai. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.7Medium

Exploit odds (30 days)0.4%top 70.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	kimai/kimai	2.53.0	GHSA-3jp4-mhh4-gcgr

Affected products (as reported)

Vendor	Product	Versions
kimai	kimai	0 – before 2.53.0

Weakness: CWE-601 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N

References

GitHub Security Advisory (GHSA-3jp4-mhh4-gcgr) vendor-advisory
VulnCheck Advisory: Kimai before 2.53.0 Open Redirect via RelayState third-party-advisory