Auth bypass in Kimai
CVE-2026-84805
Kimai versions from 2.61.0 before 2.63.0 fail to disable admin-only work-contract preferences for low-privilege users in the PATCH /api/users/{id}/preferences endpoint. Although the web interface gates these employment-contract fields behind the contract_other_profile admin permission, the WorkContractPreferenceSubscriber (introduced in 2.61.0) registers the preferences as enabled without a permission check, so an authenticated regular user can use the API to modify their own admin-only work-contract data. The issue is fixed in 2.63.0 by applying the same permission check to the API endpoint.
Vulnerability class: Broken Access Control
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 (19.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/kimai/kimai/security/advisories/GHSA-5mpc-5cg2-g99r (vendor-advisory)
- www.vulncheck.com/advisories/kimai-2.61.0-before-2.63.0-authentication-bypass-v… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-84805?
- CVE-2026-84805 is a medium-severity vulnerability in Kimai, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-09-02.
- How severe is CVE-2026-84805?
- Medium severity. CVSS v3 base score is 4.3 out of 10.