# CVE-2026-52820

## Summary

- **CVE ID:** CVE-2026-52820
- **Severity:** MEDIUM
- **CVSS Score:** 5.3 (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)
- **CWE:** CWE-639
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 15, 2026

## Description

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.

## Affected Products

- kimai — kimai (< 2.57.0)

## References

- [CNA](https://github.com/kimai/kimai/security/advisories/GHSA-vrr2-g9gh-c3jc)
- [CNA](https://github.com/kimai/kimai/pull/5929)
- [CNA](https://github.com/kimai/kimai/commit/976d38e8a4485a1c923ee7b5841849e91a06e849)
- [CNA](https://github.com/kimai/kimai/releases/tag/2.57.0)
- [CNA](https://www.kimai.org/en/security/ghsa-vrr2-g9gh-c3jc)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.27%
- **EPSS Percentile:** 19.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._