Security advisory

{
  "id": "f3e2b2711eaa83a56ce9631adcccd3c2c6573d5e7fc6ab3dce784f177331f035",
  "url": "https://osv.dev/vulnerability/CVE-2026-9558",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-9558",
    "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 on the hosting server (Remote Code Execution) or access restricted system files and configuration settings.",
    "evidence": "osv:CVE-2026-9558",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-9558",
      "aliases": [
        "CVE-2026-9558",
        "GHSA-9fx4-7cmj-47vg"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mautic/mautic",
              "type": "GIT",
              "events": [
                {
                  "introduced": "96b53794017cde917e1e4262ebaaae5099e3586a"
                },
                {
                  "fixed": "03865b3dfbe0064df47d176b897bbfe1ba60e1d3"
                },
                {
                  "introduced": "12f062e87dd1c470893724b12be7b623ecd22f2b"
                },
                {
                  "fixed": "bd92ad789274317c82f6e1e1179d56f7406bc702"
                },
                {
                  "introduced": "21ab270a3516635551d7464fc604f4e5e1ae3aea"
                },
                {
                  "fixed": "789364ee4aaf8aef5e6d91642336c1f446d5521b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "5.0.0"
                      },
                      {
                        "fixed": "5.2.11"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "6.0.0"
                      },
                      {
                        "fixed": "6.0.9"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "7.0.0"
                      },
                      {
                        "fixed": "7.1.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "5.2.10",
            "6.0.8",
            "7.1.1",
            "7.1.0",
            "7.1.0-rc",
            "6.0.7",
            "5.2.9",
            "7.0.0-beta",
            "6.0.6",
            "5.2.8",
            "6.0.5",
            "6.0.4",
            "7.0.0-alpha",
            "6.0.3",
            "6.0.2",
            "5.2.6",
            "5.2.5",
            "6.0.1",
            "6.0.0",
            "5.2.4",
            "5.2.2",
            "5.2.3",
            "6.0.0-alpha",
            "5.2.1",
            "5.2.0",
            "5.1.0",
            "5.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-9558.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.265891735Z",
      "provider": "osv",
      "references": [
        "https://packagist.org",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9558.json",
        "https://github.com/mautic/mautic/security/advisories/GHSA-9fx4-7cmj-47vg",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-9558",
        "https://github.com/mautic/mautic"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-1336"
        ],
        "cna_assigner": "Mautic",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "1.3.0"
                  },
                  {
                    "fixed": "4.4.20"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9558.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-9558",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493894,
  "published_at": "2026-05-29T10:01:36.019+00:00"
}