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CVE-2026-121373 Symfony: HtmlSanitizer MetaRefreshAttributeSanitizer Matches Only a Narrow Subset of the Browser Refresh Grammar (Incomplete Fix for CVE-2026-48761)

🗓️ 04 Nov 2026 12:59:22Reported by CheckmarxType 
cvelist
 cvelist
🔗 www.cve.org👁 11 Views

Incomplete sanitization in Symfony HtmlSanitizer MetaRefreshAttributeSanitizer allows redirection.

Related
Affected
Refs
[
  {
    "vendor": "sensiolabs",
    "product": "symfony",
    "collectionURL": "https://packagist.org/packages/symfony/html-sanitizer",
    "packageName": "symfony/html-sanitizer",
    "repo": "https://github.com/symfony/html-sanitizer",
    "modules": [
      "Symfony\\Component\\HtmlSanitizer\\Visitor\\AttributeSanitizer\\MetaRefreshAttributeSanitizer"
    ],
    "versions": [
      {
        "status": "affected",
        "version": "6.1.0",
        "lessThan": "6.4.50",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7.0.0",
        "lessThan": "7.4.23",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8.0.0",
        "lessThan": "8.1.11",
        "versionType": "git"
      }
    ],
    "defaultStatus": "unaffected"
  }
]

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