Auth bypass in Leantime
CVE-2026-15509
A vulnerability has been found in Leantime up to 3.8.0. This impacts the function editUser/addUser of the component JSON-RPC Endpoint. The manipulation of the argument role leads to improper authorization. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.003 (27.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.1% 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: 0.000
Affected products
- Leantime — versions 3.0, 3.1, 3.2
Weakness classification (CWE)
References
- vuldb.com/vuln/377838 (technical-description, vdb-entry)
- vuldb.com/vuln/377838/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-15509 (third-party-advisory)
- vuldb.com/submit/846167 (third-party-advisory)
- bytium.com/insights/leantime-priv-escalation-vulnerability-low-priv-to-owner (exploit)
Frequently asked questions
- What is CVE-2026-15509?
- CVE-2026-15509 is a medium-severity vulnerability in Leantime, classified under Incorrect Privilege Assignment. CVSS score: 6.3/10. Published 2026-07-12.
- How severe is CVE-2026-15509?
- Medium severity. CVSS v3 base score is 6.3 out of 10.