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Leantime CVE-2026-15509

| EUVDEUVD-2026-43250 LOW
Improper Authorization (CWE-285)
2026-07-12 VulDB GHSA-q4cr-cr7q-hp2f
Authentication Bypass Leantime
2.1
CVSS 4.0 · Vendor: VulDB

Severity by source

Vendor (VulDB) PRIMARY
2.1 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
8.1 HIGH

Network-reachable JSON-RPC endpoint, low complexity; PR:L because a valid account is required; C:H/I:H because owner-role access exposes all project data and permits arbitrary user/data modification.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (VulDB).

CVSS VectorVendor: VulDB

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

3
Severity Changed
Jul 12, 2026 - 23:22 NVD
MEDIUM LOW
CVSS changed
Jul 12, 2026 - 23:22 NVD
5.3 (MEDIUM) 2.1 (LOW)
Analysis Generated
Jul 12, 2026 - 23:16 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Privilege escalation in Leantime up to 3.8.0 allows authenticated low-privileged users to elevate their role to owner by manipulating the role argument in JSON-RPC requests to the editUser/addUser endpoint. The server fails to verify whether the calling user is authorized to assign elevated roles, a CWE-285 Improper Authorization flaw. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain or register low-privileged Leantime account
Delivery
Identify JSON-RPC endpoint URL
Exploit
Craft editUser/addUser request with elevated role value
Execution
Server processes request without authorization check
Persist
Attacker account promoted to owner
Impact
Full application control achieved
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Vulnerability AssessmentAI

Exploitation The attacker must possess a valid authenticated Leantime account with at least low-level privileges (PR:L per the CVSS 4.0 vector). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N) scores 5.3 (Medium), but the impact metrics VC:L/VI:L/VA:L appear understated given that successful exploitation yields owner-level access - a full privilege escalation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker registers or obtains a low-privileged Leantime account, then crafts a JSON-RPC request targeting the editUser or addUser function with the role argument set to the owner value. The server processes the request without validating whether the caller is permitted to assign that role, granting the attacker owner-level privileges. …
Remediation No vendor-released patch has been identified at time of analysis - the vendor did not respond to the coordinated disclosure. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-15509 vulnerability details – vuln.today
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