CVE-2026-9558Critical· 9.9▾ AbyssalPoC availableMautic has Server-Side Template Injection (SSTI) in Theme Templates
▾ Abyssal zone — Critical with a public exploit or in-the-wild use
impact 54.5 · likelihood 0.1 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Exploit-prediction probability, daily snapshots since Jul 4.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via GHSA
0.4%
0.4% → 0.6%
1 GitHub repo
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.
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.
This security issue has been addressed in the following releases:
For users on Mautic 4.x, this fix is available in:
Mautic strongly recommend upgrading to a patched version immediately.
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.
mautic/core >= 1.3.0, < 4.4.13mautic/core >= 5.0.0, < 5.2.11mautic/core >= 6.0.0, < 6.0.9mautic/core >= 7.0.0, < 7.1.2Upgrade to a patched release:
mautic/core 5.2.11mautic/core 6.0.9mautic/core 7.1.2Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-9809High· 7.6Mautic has Stored Cross-Site Scripting (XSS) in Projects Component
CVE-2026-9811Medium· 5.4Mautic has Stored Cross-Site Scripting (XSS) in Project Option Selector
CVE-2026-9557Medium· 6.4Mautic Focus component Vulnerable to SSRF
CVE-2026-9559Critical· 9.9Mautic vulnerable to Path Traversal via Campaign Import
CVE-2026-9808High· 7.1Mautic has an Authorization Bypass in API v2 Endpoints
CVE-2026-4776High· 7.1Mautic has SQL Injection in API Contact Filtering