{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0.3.1"
              },
              {
                "fixed": "1.5.3"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "088f92b18a4a3911a862b527d5eb3713f9abac24"
            },
            {
              "fixed": "f25255c82a3c6034a57d934718e10c982d29fa31"
            },
            {
              "fixed": "9f7e38be51edc38f132dfe994f37af5cf5e0e76f"
            }
          ],
          "repo": "https://github.com/rrrene/html_sanitize_ex",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-2c6f-3j54-xpcr"
  ],
  "database_specific": {
    "cna_assigner": "EEF",
    "cwe_ids": [
      "CWE-601"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66829.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "8976d64ea0b77d26093a94a43ec48a3978e8d028"
          },
          {
            "fixed": "9f7e38be51edc38f132dfe994f37af5cf5e0e76f"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the HTML5 scrubber in rrrene html_sanitize_ex allows a remote attacker to force visitors of a page to navigate to a site of the attacker's choosing via a \u003cmeta http-equiv=\"refresh\"\u003e element in sanitized HTML. HtmlSanitizeEx.html5/1 keeps attacker-supplied \u003cmeta\u003e elements in its output. A meta element acts on the whole document rather than on the fragment it was embedded in, so it can also declare document-wide directives such as Content-Security-Policy.\n\nThis is not cross-site scripting. Browsers do not navigate a meta refresh to a javascript: URL, so the uppercase JAVASCRIPT: filter bypass yields no script execution and none was demonstrated.\n\nThis issue affects html_sanitize_ex: from 0.3.1 before 1.5.3.",
  "id": "CVE-2026-66829",
  "modified": "2026-08-08T03:30:17.152411311Z",
  "published": "2026-08-06T14:49:23.468Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-66829.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-66829"
    },
    {
      "type": "WEB",
      "url": "https://repo.hex.pm"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66829.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/rrrene/html_sanitize_ex/security/advisories/GHSA-2c6f-3j54-xpcr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-66829"
    },
    {
      "type": "FIX",
      "url": "https://github.com/rrrene/html_sanitize_ex/commit/9f7e38be51edc38f132dfe994f37af5cf5e0e76f"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rrrene/html_sanitize_ex"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "html_sanitize_ex HTML5 scrubber keeps attacker-supplied meta refresh, allowing forced cross-origin redirection"
}