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    CVE-2026-9558

    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.

    Published:May 29, 2026
    Last Modified:May 29, 2026
    EPS:May 29, 2026
    EPSS Score:
    CVSS Score:9.9

    Affected Products

    Vendor
    Mautic
    Product
    Mautic

    Exploits

    https://github.com/covepseng/cve-2026-9558-poc

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High