CVE-2026-115189
Deferred Deferred - Pending Action

Server-Side Template Injection in Mautic

Publication date: 2026-10-26

Last updated on: 2026-10-26

Assigner: Mautic

Description
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.

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Meta Information

Published
2026-10-26
Last Modified
2026-10-26
Generated
2026-10-26
AI Q&A
2026-10-26
EPSS Evaluated
N/A
NVD
CVE-2026-115189
EUVD
EUVD-2026-109792

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mautic mautic From 1.3.0 (inc) to 5.2.12 (exc)
mautic mautic From 6.0.0 (inc) to 6.0.10 (exc)
mautic mautic From 7.0.0 (inc) to 7.2.2 (exc)
mautic mautic to GHSA-9fx4-7cmj-47vg (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-1336 The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine.

Attack-Flow Graph

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Executive Summary

This is a server-side template injection vulnerability in Mautic's Twig theme rendering sandbox. The sandbox was meant to restrict user-uploaded theme templates from executing arbitrary code, but it fails to fully enforce these restrictions. An authenticated user with specific permissions can upload a malicious theme that, when rendered, executes arbitrary code on the server with the privileges of the web server process.

Detection Guidance

Check Mautic version against affected ranges (>=1.3.0, <5.2.12; >=6.0.0, <6.0.10; >=7.0.0, <7.2.2). Inspect theme uploads for suspicious templates. Monitor for unauthorized file writes or unexpected server-side file access.

Impact Analysis

An attacker could execute operating system commands, read server-side files including configuration files and database credentials, write files to the filesystem, and reach internal services. This could lead to further attacks on the host system.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, including personal or health information, potentially violating GDPR, HIPAA, and other compliance requirements. Unauthorized code execution may also result in data breaches or system compromises.

Mitigation Strategies

Upgrade Mautic to patched versions (7.2.2, 6.0.10, 5.2.12) or apply ELTS fix for Mautic 4.4. Restrict core:themes:create permission to trusted administrators only. Review and remove any untrusted uploaded themes.

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