Authorization bypass through user-controlled key in kimai2 - CVE-2026-28685
Published: April 14, 2026
Vulnerability identifier: #VU125947
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-28685
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 disclose sensitive financial information.
The vulnerability exists due to improper access control in the GET /api/invoices/{id} endpoint when handling requests for invoice records by ID. A remote user can request an invoice belonging to a customer assigned to another team to disclose sensitive financial information.
The issue affects the single-item API endpoint, which does not verify access to the invoice's customer, unlike the corresponding web controller.
How to mitigate CVE-2026-28685
Install security update from vendor's website.