{"id":"CVE-2026-100370","title":"DOMSanitizer is a DOM/SVG/MathML Sanitizer for PHP 7.3+","summary":"DOMSanitizer is a DOM/SVG/MathML Sanitizer for PHP 7.3+. Prior to version 1.0.15, the isDangerousUrl() method is responsible for rejecting dangerous URL values in the href and xlink:href attributes. The weakness is that \"javascript:\" is …","severity":"medium","cvss":4.7,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N","cwe":["CWE-20"],"vendor":"rhukster","product":"dom-sanitizer","affected":["dom-sanitizer < 1.0.15"],"published":"2026-09-28","updated":"2026-09-28","sourceUpdated":"2026-09-28T21:17:10.280","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-100370","references":[{"url":"https://github.com/rhukster/dom-sanitizer/commit/10f97807e4501d60f63987f2e76a38cdbf312dcb","label":"security-advisories@github.com"},{"url":"https://github.com/rhukster/dom-sanitizer/commit/fb8f758b41134fc5fb2f563666f2330c69e31f94","label":"security-advisories@github.com"},{"url":"https://github.com/rhukster/dom-sanitizer/releases/tag/1.0.15","label":"security-advisories@github.com"},{"url":"https://github.com/rhukster/dom-sanitizer/security/advisories/GHSA-wcj2-r6vg-rm97","label":"security-advisories@github.com"},{"url":"https://github.com/rhukster/dom-sanitizer/security/advisories/GHSA-wcj2-r6vg-rm97","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-28T20:39:56.823996Z"},"ingestedAt":"2026-09-28T21:20:54.774Z","slug":"CVE-2026-100370","body":"## Overview\n\nDOMSanitizer is a DOM/SVG/MathML Sanitizer for PHP 7.3+. Prior to version 1.0.15, the isDangerousUrl() method is responsible for rejecting dangerous URL values in the href and xlink:href attributes. The weakness is that \"javascript:\" is rejected as a scheme, while \"data:\" is rejected only when the literal substring onload appears in the URL value (/^data:.*onload/i). Because data: payloads are routinely Base64-encoded, the dangerous content (<script>, event handlers, etc.) is invisible to that substring test. A URL such as data:text/html;base64,… therefore survives in href / xlink:href, even though the decoded payload is active markup. This is an incomplete input-validation / sanitization defect in the sanitizer itself. This issue has been patched in version 1.0.15.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":38,"depthScoreParts":{"impact":25.9,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[]}