{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0.3.1"
              },
              {
                "fixed": "1.5.3"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "088f92b18a4a3911a862b527d5eb3713f9abac24"
            },
            {
              "fixed": "f25255c82a3c6034a57d934718e10c982d29fa31"
            },
            {
              "fixed": "a1e804ed997e780ea71d14393cf2f701330553a6"
            }
          ],
          "repo": "https://github.com/rrrene/html_sanitize_ex",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-w3f9-jjhw-wwvq"
  ],
  "database_specific": {
    "cna_assigner": "EEF",
    "cwe_ids": [
      "CWE-601"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66370.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "8976d64ea0b77d26093a94a43ec48a3978e8d028"
          },
          {
            "fixed": "a1e804ed997e780ea71d14393cf2f701330553a6"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the HTML5 scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to retarget a form already on the rendering page and receive whatever the victim submits, including credentials, via the form and formaction attributes on an \u003cinput\u003e element in sanitized HTML. HTML's form attribute associates an input with any form on the page by its id even when the input sits outside that form, and formaction on a submit control overrides the owning form's action. Neither attribute receives a scheme check, so an absolute cross-origin URL survives sanitizing.\n\nNo script executes. The scrubber allows neither form nor button, so the attacker cannot introduce a form of their own and the rendering page must already contain a form carrying an id.\n\nThis issue affects html_sanitize_ex: from 0.3.1 before 1.5.3.",
  "id": "CVE-2026-66370",
  "modified": "2026-08-09T03:30:29.514317686Z",
  "published": "2026-08-06T14:49:15.841Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-66370.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-66370"
    },
    {
      "type": "WEB",
      "url": "https://repo.hex.pm"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66370.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/rrrene/html_sanitize_ex/security/advisories/GHSA-w3f9-jjhw-wwvq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-66370"
    },
    {
      "type": "FIX",
      "url": "https://github.com/rrrene/html_sanitize_ex/commit/a1e804ed997e780ea71d14393cf2f701330553a6"
    },
    {
      "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:A/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "html_sanitize_ex HTML5 scrubber keeps attacker-supplied form-association attributes, allowing form hijacking"
}