Improper Authorization in Leantime Project Management System
CVE-2026-15509

5.3MEDIUM

Key Information:

Vendor

Leantime

Status
Leantime
Vendor
CVE Published:
12 July 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-15509?

A remote vulnerability exists in the Leantime project management system, specifically affecting versions up to 3.8.0. This flaw involves the JSON-RPC endpoint's editUser/addUser function, where improper authorization due to inadequate role manipulation can be exploited. Despite the vendor being notified about the risk, there has been no response, making this vulnerability a potential target for malicious actors aiming to escalate privileges within affected systems.

Affected Version(s)

Leantime 3.0

Leantime 3.1

Leantime 3.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-15509 - Proof of Concept

References

https://vuldb.com/vuln/377838
vdb-entrytechnical-description
https://vuldb.com/vuln/377838/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-15509
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

suffer (VulDB User)
VulDB CNA Team
.