Authorization bypass through user-controlled key in kimai2 - CVE-2026-52821
Published: June 29, 2026
Vulnerability identifier: #VU135844
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-52821
CWE-ID: CWE-639
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 create business objects under unauthorized projects.
The vulnerability exists due to improper access control in the activity creation flow when handling requests with a preset project identifier. A remote user can send a crafted request with a valid project identifier to create business objects under unauthorized projects.
The issue is persistent and requires knowledge of a valid project identifier.
How to mitigate CVE-2026-52821
Install security update from vendor's website.