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CVE-2026-52823 is an authenticated cross-site request forgery vulnerability in Kimai affecting timesheet state-changing API endpoints. The flaw stems from the use of GET requests for operations that change application state, specifically stopping a running timesheet and restarting a historical timesheet to create a new record. Because these actions can be triggered through a victim's authenticated browser session, an attacker can cause unintended server-side changes without the user's intent. The issue was corrected by removing the vulnerable GET routes and requiring PATCH for the affected operations.
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