Joomla! Core - [20260915] - Core - XSS filter bypass in InputFilter via HTML5 entity decode mismatch in Joomla 1.5.0-5.4.8, 6.0.0-6.1.3

{
  "id": "2c41698e5cdbe7b6d62416ccff4101c39f1546bc280b0b30ac1c3d9274df07cc",
  "url": "https://osv.dev/vulnerability/BIT-joomla-2026-92231",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Joomla! Core - [20260915] - Core - XSS filter bypass in InputFilter via HTML5 entity decode mismatch in Joomla 1.5.0-5.4.8, 6.0.0-6.1.3",
    "summary": "Joomla! Core - [20260915] - Core - XSS filter bypass in InputFilter via HTML5 entity decode mismatch in Joomla 1.5.0-5.4.8, 6.0.0-6.1.3 - The checkAttribute method normalized an attribute value before testing it against the \"javascript:\" scheme regex, however without decoding HTML5 entities beforehand, causing an XSS vector.",
    "evidence": "osv:BIT-joomla-2026-92231",
    "products": [
      {
        "name": {
          "value": "joomla",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.4.8",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "6.1.3",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "BIT-joomla-2026-92231",
      "aliases": [
        "BIT-joomla-2026-92231",
        "CVE-2026-92231"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "1.5.0"
                },
                {
                  "fixed": "5.4.8"
                },
                {
                  "introduced": "6.0.0"
                },
                {
                  "fixed": "6.1.3"
                }
              ]
            }
          ],
          "package": {
            "name": "joomla",
            "purl": "pkg:bitnami/joomla",
            "ecosystem": "Bitnami"
          },
          "severity": [
            {
              "type": "CVSS_V4",
              "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
            }
          ],
          "database_specific": {
            "source": "https://github.com/bitnami/vulndb/tree/main/data/joomla/BIT-joomla-2026-92231.json"
          }
        }
      ],
      "modified": "2026-10-07T14:30:10.767232980Z",
      "provider": "osv",
      "references": [
        "https://developer.joomla.org/security-centre/1095-20260915-core-xss-filter-bypass-in-inputfilter-via-html5-entity-decode-mismatch.html",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-92231",
        "https://www.joomla.org/"
      ],
      "provider_metadata": {
        "cpes": [
          "cpe:2.3:a:joomla:joomla!:*:*:*:*:*:*:*:*"
        ],
        "severity": "High"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-92231",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 95109,
  "published_at": "2026-10-07T11:45:50.242+00:00"
}