Medium 5.3Published Sep 15, 2026

CVE-2026-52820Kimai: Timesheet PATCH/POST allows assigning to project outside user's team via query_builder OR-bypass

Updated under an hour ago (2026-10-19 06:10 UTC)

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Exploited in the last 30 days

Kimai is an open-source time tracking application. Prior to 2.57.0, PATCH /api/timesheets/{id} and POST /api/timesheets accept a user-controlled project identifier through TimesheetApiEditForm and FormTrait, and ProjectRepository::getQueryBuilderForFormType() places that identifier in an unconditional OR branch that bypasses the team access criteria. Any authenticated user with edit_own_timesheet can therefore assign an owned timesheet to a project outside the user's teams, persist unauthorized project attribution, and retrieve project and customer metadata through GET /api/timesheets/{id}?full=true. TimesheetTeamAccessValidator now checks changed project and activity associations against current team access. This issue is fixed in version 2.57.0.

CVSS: 5.3 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Weakness (CWE): CWE-639
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Sep 15, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

kimai kimai kimai:kimai (from the name)	before 2.57.0	CNA record

References

https://github.com/kimai/kimai/security/advisories/GHSA-vrr2-g9gh-c3jcx-refsource-confirm
https://github.com/kimai/kimai/pull/5929x-refsource-misc
https://github.com/kimai/kimai/commit/976d38e8a4485a1c923ee7b5841849e91a06e849x-refsource-misc
https://github.com/kimai/kimai/releases/tag/2.57.0x-refsource-misc
https://www.kimai.org/en/security/ghsa-vrr2-g9gh-c3jcx-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.