Vulnerability · Published Aug 25, 2026 · Assigned by VulnCheck

CVE-2026-80197Kimai before 2.57.0 Improper Authorization via Favorite Endpoints

Medium 4.3

In plain English

A medium-severity authorization bypass via user-controlled key 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 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.3%top 81.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Kimai before 2.57.0 contains an improper authorization vulnerability in the favorite timesheet add and remove endpoints that allows authenticated users to manipulate other users' bookmarks. Attackers can add or remove timesheet entries from another user's favorite list by referencing their timesheet identifier, enabling cross-user business-state tampering without administrative privileges.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	kimai/kimai	2.57.0	GHSA-j5mc-p8qg-39j7

Affected products (as reported)

Vendor	Product	Versions
kimai	kimai	0 – before 2.57.0

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

References

GitHub Security Advisory (GHSA-j5mc-p8qg-39j7) vendor-advisory
VulnCheck Advisory: Kimai before 2.57.0 Improper Authorization via Favorite Endpoints third-party-advisory