CVE-2026-9558
Mautic Twig Template Injection Vulnerability
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.
INFO
Published Date :
May 29, 2026, 11:16 a.m.
Last Modified :
July 21, 2026, 12:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | CRITICAL | 4e531c38-7a33-45d3-98dd-d909c0d8852e | ||||
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update Mautic to the latest version.
- Restrict theme upload permissions.
- Review uploaded themes for malicious code.
Public PoC/Exploit Available at Github
CVE-2026-9558 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-9558.
| URL | Resource |
|---|---|
| https://github.com/mautic/mautic/security/advisories/GHSA-9fx4-7cmj-47vg |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-9558 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-9558
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Exploitability PoC for CVE-2026-9558 (SSTI Mautic Theme)
Shell Twig
📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.
security cve exploit poc vulnerability
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-9558 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-9558 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 21, 2026
Action Type Old Value New Value Added Translation Title: varias versiones de Mautic, Description: Una vulnerabilidad de inyección de plantillas del lado del servidor (SSTI) existe en el motor de temas de Mautic. La plataforma renderiza plantillas Twig subidas sin un sandbox o restricciones estrictas de funciones. Usuarios autenticados con permisos para crear o subir temas pueden abusar de esto para ejecutar código arbitrario en el servidor de alojamiento (Ejecución remota de código) o acceder a archivos de sistema restringidos y configuraciones. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/mautic/mautic', 'versions': [{'status': 'affected', 'version': '1.3.0', 'lessThan': '4.4.20', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.0.0', 'lessThan': '5.2.11', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.0.0', 'lessThan': '6.0.9', 'versionType': 'semver'}, {'status': 'affected', 'version': '7.0.0', 'lessThan': '7.1.2', 'versionType': 'semver'}], 'packageName': 'mautic/core', 'collectionURL': 'https://packagist.org', 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-9558', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-05-29T10:48:50.985840Z'} -
New CVE Received by [email protected]
May. 29, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Added CWE CWE-1336 Added Reference https://github.com/mautic/mautic/security/advisories/GHSA-9fx4-7cmj-47vg