{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-121373", "assignerOrgId": "596c5446-0ce5-4ba2-aa66-48b3b757a647", "state": "PUBLISHED", "assignerShortName": "Checkmarx", "dateReserved": "2026-11-03T11:38:38.187Z", "datePublished": "2026-11-04T12:59:22.585Z", "dateUpdated": "2026-11-04T18:20:22.620Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "596c5446-0ce5-4ba2-aa66-48b3b757a647", "shortName": "Checkmarx", "dateUpdated": "2026-11-04T18:14:54.592Z"}, "title": "Symfony: HtmlSanitizer MetaRefreshAttributeSanitizer Matches Only a Narrow Subset of the Browser Refresh Grammar (Incomplete Fix for CVE-2026-48761)", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-186", "description": "CWE-186 Overly restrictive regular expression", "type": "CWE"}]}, {"descriptions": [{"lang": "en", "cweId": "CWE-601", "description": "CWE-601 URL redirection to untrusted site ('open redirect')", "type": "CWE"}]}], "affected": [{"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"}], "cpeApplicability": [{"operator": "OR", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.0", "versionEndExcluding": "6.4.50"}, {"vulnerable": true, "criteria": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0.0", "versionEndExcluding": "7.4.23"}, {"vulnerable": true, "criteria": "cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*", "versionStartIncluding": "8.0.0", "versionEndExcluding": "8.1.11"}]}]}], "descriptions": [{"lang": "en", "value": "The Symfony HtmlSanitizer component\u00a0MetaRefreshAttributeSanitizer, introduced to fix\u00a0CVE-2026-48761,\u00a0sanitizes\u00a0the refresh URL of\u00a0content\u00a0attributes of\u00a0meta\u00a0tags using a regular expression that is too narrow, allowing sanitization to be bypassed, and resulting in potential URL redirection to untrusted sites in Symfony versions 6.1.x prior to\u00a06.4.50, 7.x prior to 7.4.23, and 8.x prior to 8.1.11.\n\n\n\n\nThe shared declarative refresh steps in the WHATWG HTML Standard\u00a0require a broader approach: the separator after the time may be ASCII whitespace alone, with no\u00a0;\u00a0or\u00a0,, and the\u00a0url=\u00a0keyword is optional. 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