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Critical

Mautic has Server-Side Template Injection (SSTI) in Theme Templates

  • Disclosed: 02.07.2026
  • Updated: 11.10.2026 10:22

Summary

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.

Impact

An authenticated user with theme upload and creation privileges can bypass boundaries to execute arbitrary system commands on the hosting server (Remote Code Execution) or access restricted system files and configuration settings.

Patched Versions

This security issue has been addressed in the following releases:

  • 7.1.2
  • 6.0.9
  • 5.2.11

For users on Mautic 4.x, this fix is available in:

Mautic strongly recommend upgrading to a patched version immediately.

Workarounds

There are no official workarounds. To mitigate this vulnerability without upgrading, restrict theme upload and creation permissions (core:themes:create) to only highly trusted administrators.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Composer package mautic/core >= 1.3.0, >= 5.0.0, < 5.2.11, >= 6.0.0, < 6.0.9, >= 7.0.0, < 7.1.2 5.2.11, 6.0.9, 7.1.2

References

CVSS score 9.9/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE)
CWE-1336
Platform
Composer
Package
mautic/core
Disclosed
02.07.2026
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-9fx4-7cmj-47vg - CC BY 4.0

Vulnerability history: mautic/core

All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (57) in the archive
Total entries
57
First → latest
01.2021 07.2026
Without a fix
1
Exploited in attacks
0

Severity breakdown

  • Critical 9
  • High 17
  • Medium 29
  • Low 2

Disclosures per year

Severity:
  1. Mautic has Stored Cross-Site Scripting (XSS) in Projects Component
    High · 7.6 CVE-2026-9809 >= 7.0.0, < 7.1.2 7.1.2
  2. Mautic has an Authorization Bypass in API v2 Endpoints
    High · 7.1 CVE-2026-9808 >= 7.0.0, < 7.1.2 7.1.2
  3. Mautic vulnerable to Path Traversal via Campaign Import
    Critical · 9.9 CVE-2026-9559 >= 7.0.0, < 7.1.2 7.1.2
  4. Mautic has Server-Side Template Injection (SSTI) in Theme Templates this entry
    Critical · 9.9 CVE-2026-9558 >= 1.3.0, >= 5.0.0, < 5.2.11, >= 6.0.0, < 6.0.9, >= 7.0.0, < 7.1.2 5.2.11, 6.0.9, 7.1.2
  5. Mautic has SQL Injection in API Contact Filtering
    High · 7.1 CVE-2026-4776 >= 2.6.0, <= 4.4.13, >= 5.0.0, < 5.2.11, >= 6.0.0, < 6.0.9, >= 7.0.0, < 7.1.2 5.2.11, 6.0.9, 7.1.2
  6. Mautic is Vulnerable to SQL Injection through Contact Activity API Sorting
    High · 7.6 CVE-2026-3105 >= 2.10.0, < 5.2.10, >= 6.0.0-alpha, < 6.0.8, >= 7.0.0-alpha, < 7.0.1 5.2.10, 6.0.8, 7.0.1
  7. Mautic user without privileged access to the Marketplace can install and uninstall composer packages
    Critical CVE-2025-13828 >= 4.0.0, < 4.4.18, >= 5.0.0, < 5.2.9, >= 6.0.0, < 6.0.7 4.4.18, 5.2.9, 6.0.7
  8. Mautic allows Improper Authorization in Reporting API
    High · 7.7 CVE-2024-47053 >= 1.0.1, < 5.2.3 5.2.3
  9. Mautic allows Remote Code Execution and File Deletion in Asset Uploads
    Critical · 9.1 CVE-2024-47051 < 5.2.3 5.2.3
  10. Mautic vulnerable to Improper Access Control in UI upgrade process
    High · 7.0 CVE-2022-25768 >= 1.1.3, < 4.4.13, >= 5.0.0-alpha, < 5.1.1 4.4.13, 5.1.1
  11. Mautic is vulnerable to XSS vulnerability
    Critical · 9.6 CVE-2020-35125 < 2.16.5, >= 3.0.0, < 3.2.4 2.16.5, 3.2.4
  12. Mautic Sensitive Data Exposure due to inadequate user permission settings
    High · 8.3 CVE-2022-25776 >= 1.0.2, < 4.4.12, >= 5.0.0-alpha, < 5.0.4 4.4.12, 5.0.4
  13. Mautic vulnerable to Relative Path Traversal / Arbitrary File Deletion due to GrapesJS builder
    High · 8.1 CVE-2021-27916 >= 3.3.0, < 4.4.12, >= 5.0.0-alpha, < 5.0.4 4.4.12, 5.0.4
  14. Mautic vulnerable to stored cross-site scripting in description field
    High · 7.6 CVE-2021-27915 >= 1.0.0-beta2, < 4.4.12 4.4.12
  15. Cross-site Scripting vulnerability in Mautic's tracking pixel functionality
    Critical · 9.6 CVE-2022-25772 < 4.3.0 4.3.0
  16. Mautic stored Cross-site Scripting (XSS)
    Critical · 9.0 CVE-2020-35129 < 3.2.4 3.2.4
  17. Mautic stored Cross-site Scripting (XSS)
    Critical · 9.0 CVE-2020-35128 >= 3.2.0, < 3.2.4, >= 2.0.0, < 2.16.5 3.2.4, 2.16.5
  18. Sensitive Cookie Without HttpOnly and Secure Flag
    High · 7.5 CVE-2017-1000046 < 2.1.1 2.1.1
  19. Mautic Cross-Site Request Forgery (CSRF)
    High · 8.8 CVE-2017-8874 = 1.4.1 no fix
  20. Stored XSS vulnerability on Bounce Management Callback
    High · 8.2 CVE-2021-27910 < 3.3.4, >= 4.0.0-alpha1, < 4.0.0 3.3.4, 4.0.0
  21. XSS vulnerability on contacts view
    High · 8.3 CVE-2021-27911 < 3.3.4, >= 4.0.0-alpha1, < 4.0.0 3.3.4, 4.0.0
  22. XSS vulnerability on asset view
    High · 7.1 CVE-2021-27912 < 3.3.4, >= 4.0.0-alpha1, < 4.0.0 3.3.4, 4.0.0
  23. XSS in Mautic
    High CVE-2021-3142 >= 3.0.0, < 3.2.4, >= 2.0.0, < 2.16.5 3.2.4, 2.16.5
  24. Mautic Sessions could be hijacked due to tracking contacts by an auto-incremented ID
    High · 7.5 CVE-2018-10189 < 2.13.0 2.13.0
  25. Disabled users able to log in with third party SSO plugin
    High · 8.1 CVE-2017-1000489 >= 2.0.0, < 2.12.0 2.12.0
  26. XSS vulnerability leveraged through referrers could allow un-authorized admin access in Mautic
    Critical CVE-2020-35124 >= 3.0.0, < 3.2.4, >= 2.0.0, < 2.16.5 3.2.4, 2.16.5

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