Weak Password Recovery Mechanism for Forgotten Password in kimai2 - #VU135840
Published: June 29, 2026
Vulnerability identifier: #VU135840
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: N/A
CWE-ID: CWE-640
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 attacker to gain unauthorized access to a user account.
The vulnerability exists due to weak password recovery mechanism in the login link handler when processing password reset and login links. A remote attacker can use an intercepted or cached login link after the password has been changed to gain unauthorized access to a user account.
The same link remains valid for up to 3 total uses within a 1-hour window, and subsequent uses grant a normal authenticated session after the initial password reset flow has completed.
Remediation
Install security update from vendor's website.