Mautic has Server-Side Template Injection (SSTI) in Theme Templates

Date Jul 2, 2026

Type Vendor advisory

Signal High-risk advisory

Vendor / Product Composer · mautic/core

CVE CVE-2026-9558

High-risk advisory CVE-2026-9558

Summary

Mautic has Server-Side Template Injection (SSTI) in Theme Templates

Why it matters

GitHub has published a reviewed security advisory for mautic/core. Prioritize it with other application dependency updates, especially because EPSS places it in the 35% percentile.

Operator check

Check whether mautic/core is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. EPSS probability: 0.4%; percentile: 35%.

Sources

GitHub Advisory GHSA-9fx4-7cmj-47vg NVD — CVE-2026-9558 Source reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

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