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CVE-2026-9558

CRITICAL
9.9
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-9558
State
PUBLISHED
Assigner
Mautic
Reserved
2026-05-26 08:36 UTC
Published
2026-05-29 10:01 UTC
Last updated
2026-05-29 10:49 UTC
Primary CWE
CWE-1336
CWE-1336 Improper Neutralization of Special Elements Used in…
Sources
cve.org  ·  NVD

Severity & Metrics

9.9 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
total
Affected products (1)
VendorProductPlatformVersions
— — — 1.3.0 < 4.4.20, 5.0.0 < 5.2.11, 6.0.0 < 6.0.9, 7.0.0 < 7.1.2
Weakness (CWE)
CWESourceDescription
CWE-1336 cna CWE-1336 Improper Neutralization of Special Elements Used in a Template Engine
CVSS scores (1)
ScoreSeverityVersionSourceVector
9.9 CRITICAL 3.1 cna CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
References (1)
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