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CVE-2026-52822 is an improper authorization vulnerability in Kimai affecting timesheet creation through restart and duplication workflows. Authenticated users whose access to a project or activity has been revoked can still create new timesheet entries associated with those unauthorized project and activity combinations. The flaw is caused by insufficient authorization enforcement during new timesheet creation paths, specifically where access checks for the referenced project and activity were not properly applied. The issue was addressed by updating authorization logic in TimesheetVoter::canStart() to enforce team access validation for project and activity during new timesheet creation, including restart and duplication operations.
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