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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.

PUBLISHED Reserved 2026-07-12 | Published 2026-07-12 | Updated 2026-07-14 | Assigner VulDB




MEDIUM: 5.3CVSS: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
MEDIUM: 6.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
MEDIUM: 6.3CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
6.5AV:N/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR

Problem types

Improper Authorization

Incorrect Privilege Assignment

Timeline

2026-07-12:Advisory disclosed
2026-07-12:VulDB entry created
2026-07-14:VulDB entry last update

Credits

Jobyer Ahmed (Bytium) finder

suffer (VulDB User) reporter

suffer (VulDB User) analyst

VulDB CNA Team coordinator

References

vuldb.com/vuln/377838 (VDB-377838 | Leantime JSON-RPC Endpoint addUser improper authorization) vdb-entry technical-description

vuldb.com/vuln/377838/cti (VDB-377838 | CTI Indicators (IOB, IOC, TTP, IOA)) signature permissions-required

vuldb.com/cve/CVE-2026-15509 (CVE-2026-15509 | CVE Analysis and Report) third-party-advisory

vuldb.com/submit/846167 (Submit #846167 | Leantime Leantime project management system 3.8.0 Privilege Escalation / Improper Authorization) third-party-advisory

bytium.com/...riv-escalation-vulnerability-low-priv-to-owner exploit

cve.org (CVE-2026-15509)

nvd.nist.gov (CVE-2026-15509)

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