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CVE PROGRAM SOURCE RECORD9.9 Critical

CVE-2026-9558

A Server-Side Template Injection (SSTI) vulnerability exists in Mautic's theme engine. The platform renders uploaded Twig templates without a sandbox or strict function restriction

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Status
Published
Published
Updated
Assigning organization
Mautic

Description

A Server-Side Template Injection (SSTI) vulnerability exists in Mautic's theme engine. The platform renders uploaded Twig templates without a sandbox or strict function restrictions. Authenticated users with permissions to create or upload themes can abuse this to execute arbitrary code on the hosting server (Remote Code Execution) or access restricted system files and configuration settings.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

mautic/core

Default version status: unaffected

  • 1.3.0 to < 4.4.20affected
  • 5.0.0 to < 5.2.11affected
  • 6.0.0 to < 6.0.9affected
  • 7.0.0 to < 7.1.2affected

References