CVE-2026-84808: Kimai before 2.65.0 Authorization Bypass via API Timesheet

Severity: medium (CVSS 4.3 v3.1)
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: 2026-09-02 · updated 2026-09-02
Weakness: CWE-863

Description

Kimai versions before 2.65.0 contain an authorization bypass vulnerability in the REST API timesheet collection endpoint that fails to enforce activity-team access controls. Users with view_other_timesheet permission can list timesheets using activities restricted to teams they do not belong to, bypassing intended data isolation.

Affected products

kimai: before 2.65.0 — fixed in 2.65.0

How to fix

Upgrade to a fixed version: kimai 2.65.0. Check the vendor advisory for mitigations.

References

https://github.com/kimai/kimai/security/advisories/GHSA-c6j4-35fc-x3hw
https://www.vulncheck.com/advisories/kimai-before-2.65.0-authorization-bypass-via-api-timesheet

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