CVE-2026-84807: Kimai before 2.65.0 Authentication Bypass via Team Creation

Severity: medium (CVSS 5.4 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 2026-10-29
Weakness: CWE-266

Description

Kimai (kimai/kimai) before 2.65.0 contains a business logic / improper authorization vulnerability in the default team creation endpoints. An authenticated user with project permission-management privileges can create or use a customer, project, or activity whose name matches an existing team; because the endpoints POST /api/customers/{id}/team, POST /api/projects/{id}/team, and POST /api/activities/{id}/team reuse an existing team of the same name and add the current user as teamlead without verifying that the user is authorized to manage that team, the attacker gains unauthorized team-lead (administration) rights over the existing team. Fixed in 2.65.0.

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

Get alerted when CVE-2026-84807 or the next vulnerability affects your stack