Leantime up to 3.8.0 JSON-RPC Endpoint editUser/addUser role improper authorization

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.7$0-$5k2.90+

Summaryinfo

A vulnerability was found in Leantime up to 3.8.0. It has been declared as critical. Affected is the function editUser/addUser of the component JSON-RPC Endpoint. The manipulation of the argument role results in improper authorization. This vulnerability was named CVE-2026-15509. The attack may be performed from remote. In addition, an exploit is available. The vendor was contacted early about this disclosure but did not respond in any way.

Detailsinfo

A vulnerability classified as critical has been found in Leantime up to 3.8.0. Affected is the function editUser/addUser of the component JSON-RPC Endpoint. The manipulation of the argument role with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality, integrity, and availability.

The advisory is available at bytium.com. This vulnerability is traded as CVE-2026-15509. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details and a public exploit are known. This vulnerability is assigned to T1548.002 by the MITRE ATT&CK project.

The exploit is shared for download at bytium.com. It is declared as proof-of-concept. The vendor was contacted early about this disclosure but did not respond in any way.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 5.7

VulDB Base Score: 6.3
VulDB Temp Score: 5.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper authorization
CWE: CWE-285 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

07/12/2026 Advisory disclosed
07/12/2026 +0 days VulDB entry created
07/12/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: bytium.com
Status: Not defined

CVE: CVE-2026-15509 (🔒)
GCVE (CVE): GCVE-0-2026-15509
GCVE (VulDB): GCVE-100-377838
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 07/12/2026 08:03
Changes: 07/12/2026 08:03 (56)
Complete: 🔍
Submitter: suffer
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #846167: Leantime Leantime project management system 3.8.0 Privilege Escalation / Improper Authorization (by suffer)

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