Improper Authentication in kimai2 - CVE-2026-52827
Published: June 29, 2026
Vulnerability identifier: #VU135851
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-52827
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Kevin Papst
Affected software:
kimai2
kimai2
Detailed vulnerability description
The vulnerability allows a remote user to bypass two-factor authentication and gain authenticated API access.
The vulnerability exists due to improper authentication in the API firewall / authorization when handling API requests with a login session that is still in the two-factor authentication flow. A remote user can replay the session cookie returned after password verification to bypass two-factor authentication and gain authenticated API access.
This affects accounts with two-factor authentication enabled, and web routes are not affected.
How to mitigate CVE-2026-52827
Install security update from vendor's website.