{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-126207", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-11-10T20:07:44.958Z", "datePublished": "2026-11-12T20:53:55.553Z", "dateUpdated": "2026-11-12T20:53:55.553Z"}, "containers": {"cna": {"title": "Loofah: CSS url() sanitization bypass via escaped parentheses", "problemTypes": [{"descriptions": [{"cweId": "CWE-180", "lang": "en", "description": "CWE-180: Incorrect Behavior Order: Validate Before Canonicalize", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-184", "lang": "en", "description": "CWE-184: Incomplete List of Disallowed Inputs", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/flavorjones/loofah/security/advisories/GHSA-m3x9-938q-5767", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/flavorjones/loofah/security/advisories/GHSA-m3x9-938q-5767"}, {"name": "https://github.com/flavorjones/loofah/pull/324", "tags": ["x_refsource_MISC"], "url": "https://github.com/flavorjones/loofah/pull/324"}, {"name": "https://github.com/flavorjones/loofah/commit/b198a36e44c9c5408163ac50787825e8ca0b166b", "tags": ["x_refsource_MISC"], "url": "https://github.com/flavorjones/loofah/commit/b198a36e44c9c5408163ac50787825e8ca0b166b"}, {"name": "https://github.com/flavorjones/loofah/releases/tag/v2.25.3", "tags": ["x_refsource_MISC"], "url": "https://github.com/flavorjones/loofah/releases/tag/v2.25.3"}], "affected": [{"vendor": "flavorjones", "product": "loofah", "versions": [{"version": "< 2.25.3", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-11-12T20:53:55.553Z"}, "descriptions": [{"lang": "en", "value": "Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. Prior to 2.25.3, Loofah::HTML5::Scrub.scrub_css checks only the first parse of a style attribute, then rebuilds CSS with identifier escapes decoded so escaped parentheses, property names, comments, or quotes can become a live url() without a second safety check. An attacker can use list-style to make a viewer's browser request an attacker-chosen URL when content renders, or cursor to make the request on hover. The request can disclose the viewer's IP address, user agent, access timing, and access to internal-network hosts, but no script survives sanitization and the attacker cannot read the response. This issue is fixed in version 2.25.3."}], "source": {"advisory": "GHSA-m3x9-938q-5767", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "loofah", "vendor": "flavorjones", "versions": [{"status": "affected", "version": "< 2.25.3"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. Prior to 2.25.3, Loofah::HTML5::Scrub.scrub_css checks only the first parse of a style attribute, then rebuilds CSS with identifier escapes decoded so escaped parentheses, property names, comments, or quotes can become a live url() without a second safety check. An attacker can use list-style to make a viewer's browser request an attacker-chosen URL when content renders, or cursor to make the request on hover. The request can disclose the viewer's IP address, user agent, access timing, and access to internal-network hosts, but no script survives sanitization and the attacker cannot read the response. This issue is fixed in version 2.25.3."}], "id": "CVE-2026-126207", "lastModified": "2026-11-12T22:09:39.233", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-11-12T21:17:21.853", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/flavorjones/loofah/commit/b198a36e44c9c5408163ac50787825e8ca0b166b"}, {"source": "security-advisories@github.com", "url": "https://github.com/flavorjones/loofah/pull/324"}, {"source": "security-advisories@github.com", "url": "https://github.com/flavorjones/loofah/releases/tag/v2.25.3"}, {"source": "security-advisories@github.com", "url": "https://github.com/flavorjones/loofah/security/advisories/GHSA-m3x9-938q-5767"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-180"}, {"lang": "en", "value": "CWE-184"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{}