Vulnerability · Published Apr 17, 2026 · Assigned by GitHub_M

CVE-2026-40486Kimai's User Preferences API allows standard users to modify restricted attributes: hourly_rate, internal_rate

Medium 4.3

In plain English

A medium-severity security flaw in kimai from kimai. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% 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 81.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Kimai is an open-source time tracking application. In versions 2.52.0 and below, the User Preferences API endpoint (PATCH /api/users/{id}/preferences) applies submitted preference values without checking the isEnabled() flag on preference objects. Although the hourly_rate and internal_rate fields are correctly marked as disabled for users lacking the hourly-rate role permission, the API ignores this restriction and saves the values directly. Any authenticated user can modify their own billing rates through this endpoint, resulting in unauthorized financial tampering affecting invoices and timesheet calculations. This issue has been fixed in version 2.53.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	kimai/kimai	2.53.0	GHSA-qh43-xrjm-4ggp

Affected products (as reported)

Vendor	Product	Versions
kimai	kimai	< 2.53.0

Weakness: CWE-915 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

References

https://github.com/kimai/kimai/security/advisories/GHSA-qh43-xrjm-4ggp x_refsource_CONFIRM
https://github.com/kimai/kimai/releases/tag/2.53.0 x_refsource_MISC