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CVE-2026-9558

CVSS 9.9 · Critical EPSS 0.20% · P41

Affected Version Matrix 4

VendorProductVersion RangeStatus
NoneNone1.3.0< 4.4.20affected
5.0.0< 5.2.11affected
6.0.0< 6.0.9affected
7.0.0< 7.1.2affected

I. Basic Information for CVE-2026-9558

Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-1336
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
-- 1.3.0 ~ 4.4.20 -

II. Public POCs for CVE-2026-9558

#POC DescriptionSource LinkShenlong Link
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III. Intelligence Information for CVE-2026-9558

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Vendor Advisories for CVE-2026-9558 (1)

IV. Related Vulnerabilities

Same weakness: CWE-1336

V. Comments for CVE-2026-9558

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