Mautic up to 5.2.11/6.0.9/7.2.1 Twig theme rendering sandbox special elements in template engine

Summaryinfo

A vulnerability classified as problematic was found in Mautic up to 5.2.11/6.0.9/7.2.1. This affects an unknown function of the component Twig theme rendering sandbox. Executing a manipulation can lead to special elements in template engine. This vulnerability is tracked as CVE-2026-115189. The attack can be launched remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic was found in Mautic up to 5.2.11/6.0.9/7.2.1. This vulnerability affects an unknown function of the component Twig theme rendering sandbox. The manipulation with an unknown input leads to a special elements in template engine vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-115189 since 10/22/2026. The exploitation appears to be easy. The attack can be initiated remotely. Additional levels of successful authentication are required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1221.

Upgrading to version 5.2.12, 6.0.10 or 7.2.2 eliminates this vulnerability.

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Productinfo

Name

• Mautic

Version

• 5.2.0
• 5.2.1
• 5.2.2
• 5.2.3
• 5.2.4
• 5.2.5
• 5.2.6
• 5.2.7
• 5.2.8
• 5.2.9
• 5.2.10
• 5.2.11
• 6.0.0
• 6.0.1
• 6.0.2
• 6.0.3
• 6.0.4
• 6.0.5
• 6.0.6
• 6.0.7
• 6.0.8
• 6.0.9
• 7.2.0
• 7.2.1

License

• open-source

Website

• Product: https://github.com/mautic/mautic/

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