SB20260629128 - Improper Authentication in kimai2

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Authentication (CVE-ID: CVE-2026-52827)

CWE-ID: CWE-287 - Improper Authentication

CVSSv4: 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

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.

Remediation

Install update from vendor's website.

References

• https://github.com/kimai/kimai/security/advisories/GHSA-v8hx-4vx8-wc96
• https://www.kimai.org/en/security/ghsa-v8hx-4vx8-wc96