CVE-2026-115189

A server-side template injection vulnerability exists in the Twig theme rendering sandbox of Mautic. The sandbox introduced to restrict user-uploaded theme templates (the fix for GHSA-9fx4-7cmj-47vg) does not fully enforce its restrictions, allowing a crafted theme template to escape the sandbox. An authenticated user with the core:themes:create permission can upload a malicious theme whose template is later rendered, resulting in execution of arbitrary code on the server with the privileges of the web server process. This allows the attacker to execute operating system commands, read server-side files including configuration files and database credentials, write files, and reach internal services. In default installations the core:themes:create permission is granted to the Administrator role, and in multi-operator setups it may be delegated to other roles. This is an incomplete fix for GHSA-9fx4-7cmj-47vg.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/mautic/mautic/security/advisories/GHSA-h7pm-79gc-8867

Configurations

No configuration.

History

26 Oct 2026, 14:21

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-26 14:16

Updated : 2026-10-26 16:17

NVD link : CVE-2026-115189

Mitre link : CVE-2026-115189

CVE.ORG link : CVE-2026-115189

JSON object : View

Products Affected

No product.

CWE

CWE-1336

Improper Neutralization of Special Elements Used in a Template Engine

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