Auth bypass in Kimai
CVE-2026-80202
Kimai before 2.56.0 does not enforce team-membership checks in TimesheetVoter::voteOnAttribute(), which maps permissions only to own_timesheet or other_timesheet. As a result, any authenticated user with ROLE_TEAMLEAD (or a role holding edit_other_timesheet/delete_other_timesheet) can read, modify, and permanently delete timesheets belonging to any user system-wide via the API, regardless of team membership. Timesheet IDs are sequential integers and trivially enumerable. ROLE_USER accounts are correctly restricted. (Note: the maintainers characterize this behavior as matching the documented permission model.)
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (31.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.000
Affected products
Weakness classification (CWE)
References
- github.com/kimai/kimai/security/advisories/GHSA-9g2q-w3w2-vf7q (vendor-advisory)
- www.vulncheck.com/advisories/kimai-before-2.56.0-authorization-bypass-via-times… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-80202?
- CVE-2026-80202 is a high-severity vulnerability in Kimai, classified under Incorrect Authorization. CVSS score: 8.8/10. Published 2026-08-26.
- How severe is CVE-2026-80202?
- High severity. CVSS v3 base score is 8.8 out of 10.