Vulnerability · Published Sep 15, 2026 · Assigned by GitHub_M
CVE-2026-52819Kimai: Teamlead authorization bypass in GET /api/timesheets allows reading other users' timesheet records without being teamlead of the target
Medium 6.3
In plain English
A medium-severity incorrect authorization in kimai from kimai. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Kimai is an open-source time tracking application. Prior to 2.57.0, the GET /api/timesheets list endpoint accepts user and users[] target identifiers from a caller with view_other_timesheet but does not apply access_user or verify that a ROLE_TEAMLEAD requester leads a team containing each target user. TimesheetController::cgetAction() adds the resolved users directly to the query while project and customer filtering still permits records on unscoped projects or projects sharing ordinary team membership, allowing a teamlead to retrieve another user's descriptions, timing data, tags, rate, and internalRate even though GET /api/timesheets/{id} would deny access through TimesheetVoter. This issue is fixed in version 2.57.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | kimai/kimai | 2.57.0 | GHSA-4m8q-55qv-9pwp |
Affected products (as reported)
Weakness: CWE-863 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
References
- https://github.com/kimai/kimai/security/advisories/GHSA-4m8q-55qv-9pwp x_refsource_CONFIRM
- https://github.com/kimai/kimai/pull/5929 x_refsource_MISC
- https://github.com/kimai/kimai/commit/976d38e8a4485a1c923ee7b5841849e91a06e849 x_refsource_MISC
- https://github.com/kimai/kimai/releases/tag/2.57.0 x_refsource_MISC
- https://www.kimai.org/en/security/ghsa-4m8q-55qv-9pwp x_refsource_MISC