CVE-2026-115189 A server-side template injection vulnerability exists in the Twig theme rendering sandbox of Mautic.
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-115189?
CVE-2026-115189 is a high-severity vulnerability, published on 26 Oct 2026.
Official 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.
Weakness: CWE-1336
Which versions are affected by CVE-2026-115189?
How do I fix CVE-2026-115189?
No fix has been published for CVE-2026-115189 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-115189 being exploited?
There is no known exploitation of CVE-2026-115189 in the wild and no public exploit code.
Sources
Also known as GHSA-h7pm-79gc-8867.