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NVD Vulnerability Details :
CVE-2026-9558
Received
More InfoOfficial Page
Source-security@mautic.org
View Known Exploited Vulnerability (KEV) details
Published At-29 May, 2026 | 11:16
Updated At-29 May, 2026 | 11:16

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.19.9CRITICAL
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Type: Secondary
Version: 3.1
Base score: 9.9
Base severity: CRITICAL
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-1336Secondarysecurity@mautic.org
CWE ID: CWE-1336
Type: Secondary
Source: security@mautic.org
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/mautic/mautic/security/advisories/GHSA-9fx4-7cmj-47vgsecurity@mautic.org
N/A
Hyperlink: https://github.com/mautic/mautic/security/advisories/GHSA-9fx4-7cmj-47vg
Source: security@mautic.org
Resource: N/A
Change History
0Changes found
Details not found