CVE-2026-52819 Kimai: Teamlead authorization bypass in GET /api/timesheets allows reading other users' timesheet records without being teamlead of the target
A teamlead can read other users' timesheet records without proper authorization checks, exposing sensitive timing and rate data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-52819?
CVE-2026-52819 is a medium-severity missing authorization vulnerability in kimai, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-863
Which versions are affected by CVE-2026-52819?
2 open source packages ship an affected version, including kimai/kimai.
| Package | Affected | Fixed in |
|---|---|---|
kimai/kimai Packagist | All versions | 2.57.0 |
kimai/kimai Packagist | All versions | 2.57.0 |
How do I fix CVE-2026-52819?
Upgrade kimai/kimai to 2.57.0 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-52819 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-52819 exists.
Sources
Also known as GHSA-4m8q-55qv-9pwp.