[20260905] - Core - Arbitrary directory deletion via cache purge action

{
  "id": "91717dae5f109d1dba215ff6e6551220c3b8396b1ab7411ceb6736bf0ca19484",
  "url": "https://developer.joomla.org/security-centre/1085-20260905-core-arbitrary-directory-deletion-via-cache-purge-action.html",
  "method": "llm",
  "payload": {
    "kind": "patch",
    "title": "[20260905] - Core - Arbitrary directory deletion via cache purge action",
    "summary": "Joomla! CMS fixed a path traversal vulnerability that could allow arbitrary directory deletions. Upgrade to a listed fixed version.",
    "evidence": "An improper validation of the cache group name allowed path traverals in the file storage of the caching layer, resulting in arbitrary directory deletions.",
    "products": [
      {
        "name": {
          "value": "Joomla! CMS",
          "evidence": "Affected Installs Joomla! CMS versions 4.0.0-5.4.8, 6.0.0-6.1.3"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.4.9",
            "evidence": "Solution Upgrade to version 5.4.9, 6.1.4"
          },
          {
            "value": "6.1.4",
            "evidence": "Solution Upgrade to version 5.4.9, 6.1.4"
          }
        ],
        "affected_versions": [
          {
            "value": "4.0.0-5.4.8",
            "evidence": "Affected Installs Joomla! CMS versions 4.0.0-5.4.8, 6.0.0-6.1.3"
          },
          {
            "value": "6.0.0-6.1.3",
            "evidence": "Affected Installs Joomla! CMS versions 4.0.0-5.4.8, 6.0.0-6.1.3"
          }
        ]
      }
    ],
    "severity": "high",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-90915",
        "evidence": "CVE Number: CVE-2026-90915"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "Severity: High"
  },
  "source_id": "official-joomla-security",
  "document_id": 23881,
  "published_at": "2026-09-25T14:00:04+00:00"
}