Open Redirect in Kimai
CVE-2026-80200
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.
Vulnerability class: Open Redirect
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (27.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/kimai/kimai/security/advisories/GHSA-3jp4-mhh4-gcgr (vendor-advisory)
- www.vulncheck.com/advisories/kimai-before-2.53.0-open-redirect-via-relaystate (third-party-advisory)
Frequently asked questions
- What is CVE-2026-80200?
- CVE-2026-80200 is a medium-severity vulnerability in Kimai, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.7/10. Published 2026-08-26.
- How severe is CVE-2026-80200?
- Medium severity. CVSS v3 base score is 4.7 out of 10.