Security advisory

{
  "id": "954eeb9fb7ee16009089c7e0dc1d9243c5f04839580a7c230aad1bdec559886a",
  "url": "https://osv.dev/vulnerability/CVE-2026-90915",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-90915",
    "summary": "Joomla! Core - [20260905] - Core - Arbitrary directory deletion via cache purge action in Joomla 4.0.0-5.4.8, 6.0.0-6.1.3 -An improper validation of the cache group name allowed path traverals in the file storage of the caching layer, resulting in arbitrary directory deletions.",
    "evidence": "osv:CVE-2026-90915",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-90915",
      "aliases": [
        "BIT-joomla-2026-90915",
        "CVE-2026-90915"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/joomla/joomla-cms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "5f20de27b9640124ba185670a36ec40ebc9ec3f9"
                },
                {
                  "fixed": "e08f97c45440266d7b51bcf1c0739e8f135bab0b"
                },
                {
                  "introduced": "0db7d502466ae41242ad761424f76378458fb819"
                },
                {
                  "fixed": "0f2d4de4729eb951e0878fec98c7990da07915b2"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:joomla:joomla\\!:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.0.0"
                      },
                      {
                        "fixed": "5.4.8"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:joomla:joomla\\!:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "6.0.0"
                      },
                      {
                        "fixed": "6.1.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90915.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:38.581364359Z",
      "provider": "osv",
      "references": [
        "https://www.joomla.org/",
        "https://developer.joomla.org/security-centre/1085-20260905-core-arbitrary-directory-deletion-via-cache-purge-action.html"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2026-90915",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 434492,
  "published_at": "2026-09-29T17:17:13.52+00:00"
}