What’s Vulnerable › Vulnerabilities

CVE-2026-52823: Kimai: Login CSRF in Kimai Timesheet Stop and Restart API Endpoints Allows Unauthorized State Changes

• Severity: medium (CVSS 5.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% 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-352

Description

Kimai is an open-source time tracking application. Prior to 2.58.0, TimesheetController exposes GET /api/timesheets/{id}/stop and GET /api/timesheets/{id}/restart, which reuse an authenticated browser session and perform state-changing operations through GET requests without a request-forgery defense. A remote attacker can cause a logged-in user to request either route from attacker-controlled content, stopping a running timesheet or restarting a historical entry to create and start a new timesheet without the user's consent. The unauthorized changes can corrupt time records, billing, reports, approvals, and audits. This issue is fixed in version 2.58.0.

Affected products

• kimai: before 2.58.0

References

• https://github.com/kimai/kimai/commit/31a8f887a5cda517db7b4320a7ad997c87d08601
• https://github.com/kimai/kimai/pull/5952
• https://github.com/kimai/kimai/releases/tag/2.58.0
• https://github.com/kimai/kimai/security/advisories/GHSA-r8vr-m544-qh4h
• https://www.kimai.org/en/security/ghsa-r8vr-m544-qh4h

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