Vulnerability in Kimai
CVE-2026-40486
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.
Vulnerability class: Mass Assignment
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (23.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.001
Affected products
- Kimai — versions < 2.53.0
Weakness classification (CWE)
References
- github.com/kimai/kimai/security/advisories/GHSA-qh43-xrjm-4ggp (Exploit, Vendor Advisory)
- github.com/kimai/kimai/releases/tag/2.53.0 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-40486?
- CVE-2026-40486 is a medium-severity vulnerability in Kimai, classified under Improperly Controlled Modification of Dynamically-Determined Object Attributes. CVSS score: 4.3/10. Published 2026-04-17.
- How severe is CVE-2026-40486?
- Medium severity. CVSS v3 base score is 4.3 out of 10.