What’s Vulnerable › Vulnerabilities

CVE-2026-80202: Kimai before 2.56.0 Authorization Bypass via TimesheetVoter

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-26 · updated 2026-10-08
• Weakness: CWE-863

Description

Kimai before 2.56.0 does not enforce team-membership checks in TimesheetVoter::voteOnAttribute(), which maps permissions only to own_timesheet or other_timesheet. As a result, any authenticated user with ROLE_TEAMLEAD (or a role holding edit_other_timesheet/delete_other_timesheet) can read, modify, and permanently delete timesheets belonging to any user system-wide via the API, regardless of team membership. Timesheet IDs are sequential integers and trivially enumerable. ROLE_USER accounts are correctly restricted. (Note: the maintainers characterize this behavior as matching the documented permission model.)

Affected products

• kimai: before 2.56.0 — fixed in 2.56.0

How to fix

Upgrade to a fixed version: kimai 2.56.0. Check the vendor advisory for mitigations.

References

• https://github.com/kimai/kimai/security/advisories/GHSA-9g2q-w3w2-vf7q
• https://www.vulncheck.com/advisories/kimai-before-2.56.0-authorization-bypass-via-timesheetvoter
• https://github.com/kimai/kimai/security/advisories/GHSA-9g2q-w3w2-vf7q

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