What’s Vulnerable › Vulnerabilities

CVE-2026-15509: Leantime JSON-RPC Endpoint addUser improper authorization

• Severity: medium (CVSS 6.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-12 · updated 2026-07-15
• Weakness: CWE-266

Description

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.

Affected products

• Leantime: 3.0, 3.1, 3.2, 3.3, 3.4, 3.5 (+3)

References

• https://bytium.com/insights/leantime-priv-escalation-vulnerability-low-priv-to-owner
• https://vuldb.com/cve/CVE-2026-15509
• https://vuldb.com/submit/846167
• https://vuldb.com/vuln/377838
• https://vuldb.com/vuln/377838/cti
• https://vuldb.com/submit/846167

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