What’s Vulnerable › Vulnerabilities

CVE-2026-52819: Kimai: Teamlead authorization bypass in GET /api/timesheets allows reading other users' timesheet records without being teamlead of the target

• Severity: medium (CVSS 6.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-15 · updated 2026-09-23
• Weakness: CWE-863

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 products

• kimai: before 2.57.0

References

• https://github.com/kimai/kimai/commit/976d38e8a4485a1c923ee7b5841849e91a06e849
• https://github.com/kimai/kimai/pull/5929
• https://github.com/kimai/kimai/releases/tag/2.57.0
• https://github.com/kimai/kimai/security/advisories/GHSA-4m8q-55qv-9pwp
• https://www.kimai.org/en/security/ghsa-4m8q-55qv-9pwp
• https://github.com/kimai/kimai/security/advisories/GHSA-4m8q-55qv-9pwp

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