GHSA-9FX4-7CMJ-47VG

Vulnerability from github – Published: 2026-07-02 19:48 – Updated: 2026-07-02 19:48
VLAI
Summary
Mautic has Server-Side Template Injection (SSTI) in Theme Templates
Details

Summary

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.

Impact

An authenticated user with theme upload and creation privileges can bypass boundaries to execute arbitrary system commands on the hosting server (Remote Code Execution) or access restricted system files and configuration settings.

Patched Versions

This security issue has been addressed in the following releases: * 7.1.2 * 6.0.9 * 5.2.11

For users on Mautic 4.x, this fix is available in: * 4.4.20 via ELTS

Mautic strongly recommend upgrading to a patched version immediately.

Workarounds

There are no official workarounds. To mitigate this vulnerability without upgrading, restrict theme upload and creation permissions (core:themes:create) to only highly trusted administrators.

Severity
9.9 (Critical)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Show details on source website
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c 4.4.13"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "mautic/core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.3.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "mautic/core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0"
            },
            {
              "fixed": "5.2.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "mautic/core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.0.0"
            },
            {
              "fixed": "6.0.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "mautic/core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "7.0.0"
            },
            {
              "fixed": "7.1.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-9558"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1336"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-02T19:48:08Z",
    "nvd_published_at": "2026-05-29T11:16:17Z",
    "severity": "CRITICAL"
  },
  "details": "### Summary\nA Server-Side Template Injection (SSTI) vulnerability exists in Mautic\u0027s 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.\n\n### Impact\nAn authenticated user with theme upload and creation privileges can bypass boundaries to execute arbitrary system commands on the hosting server (Remote Code Execution) or access restricted system files and configuration settings.\n\n### Patched Versions\nThis security issue has been addressed in the following releases:\n* **7.1.2**\n* **6.0.9**\n* **5.2.11**\n\nFor users on Mautic 4.x, this fix is available in:\n* **4.4.20** via [ELTS](https://mautic.org/extended-long-term-support-elts/)\n\nMautic strongly recommend upgrading to a patched version immediately.\n\n### Workarounds\nThere are no official workarounds. To mitigate this vulnerability without upgrading, restrict theme upload and creation permissions (`core:themes:create`) to only highly trusted administrators.",
  "id": "GHSA-9fx4-7cmj-47vg",
  "modified": "2026-07-02T19:48:08Z",
  "published": "2026-07-02T19:48:08Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/mautic/mautic/security/advisories/GHSA-9fx4-7cmj-47vg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9558"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/mautic/mautic"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Mautic has Server-Side Template Injection (SSTI) in Theme Templates"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.