CVE-2026-15509
Leantime JSON-RPC Endpoint addUser improper authorization
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.
INFO
Published Date :
July 12, 2026, 11:16 p.m.
Last Modified :
July 12, 2026, 11:16 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-15509
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | LOW | [email protected] |
Solution
- Update Leantime to a version later than 3.8.0.
- Apply vendor patches if available.
- Review access controls for user roles.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-15509.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-15509 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-15509
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-15509 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-15509 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Jul. 12, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:2.3:a:leantime:leantime:*:*:*:*:*:*:*:*'], 'vendor': 'n/a', 'modules': ['JSON-RPC Endpoint'], 'product': 'Leantime', 'versions': [{'status': 'affected', 'version': '3.0'}, {'status': 'affected', 'version': '3.1'}, {'status': 'affected', 'version': '3.2'}, {'status': 'affected', 'version': '3.3'}, {'status': 'affected', 'version': '3.4'}, {'status': 'affected', 'version': '3.5'}, {'status': 'affected', 'version': '3.6'}, {'status': 'affected', 'version': '3.7'}, {'status': 'affected', 'version': '3.8.0'}]}] Added 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. Added CVSS V4.0 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 Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L Added CVSS V2 (AV:N/AC:L/Au:S/C:P/I:P/A:P) Added CWE CWE-285 Added CWE CWE-266 Added Reference https://bytium.com/insights/leantime-priv-escalation-vulnerability-low-priv-to-owner Added Reference https://vuldb.com/cve/CVE-2026-15509 Added Reference https://vuldb.com/submit/846167 Added Reference https://vuldb.com/vuln/377838 Added Reference https://vuldb.com/vuln/377838/cti