Vulnerability · Published Aug 25, 2026 · Assigned by VulnCheck

CVE-2026-80195Kimai before 2.63.0 Team Membership Removal via API

Medium 5.4

In plain English

A medium-severity security flaw in kimai from kimai. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.4%top 70.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Kimai before 2.63.0 contains a business logic / improper authorization vulnerability in the team update API endpoint (PATCH /api/teams/{id}), which removes all existing team members before validating the submitted replacement member list. An authenticated teamlead (or other user) with permission to edit a team can submit a malformed members payload; although Kimai returns a validation error, the existing membership rows have already been deleted. This bypasses the dedicated member-removal endpoint's protection against removing teamleaders and can leave a team with no members or teamleaders, disrupting team-based access control.

Affected products (as reported)

Vendor	Product	Versions
kimai	kimai	0 – before 2.63.0

Weakness: CWE-841 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

References

GitHub Security Advisory (GHSA-6rxf-4hh9-pp46) vendor-advisory
VulnCheck Advisory: Kimai before 2.63.0 Team Membership Removal via API third-party-advisory