{"id":"CVE-2026-61784","revision":"e22186bfc6054e58a5b845fc0e7f2697","records":[{"revision":"e22186bfc6054e58a5b845fc0e7f2697","observedAt":"2026-10-25T14:19:28.838+00:00","statement":{"source":"nvd","id":"CVE-2026-61784","aliases":[],"title":"xhtml-purifier is a Node.js library to take in raw/unknown/untrusted HTML and output cleaned, purified, trusted HTML. Versions prior to 0.4.3 do not HTML-entity-encode attribute values when serializing its sanitized output. In attributeStri…","description":"xhtml-purifier is a Node.js library to take in raw/unknown/untrusted HTML and output cleaned, purified, trusted HTML. Versions prior to 0.4.3 do not HTML-entity-encode attribute values when serializing its sanitized output. In attributeString() (XHTMLPurifier.js, around line 148) the attribute value is concatenated directly into a double-quoted attribute without encoding. As a result, an attacker-controlled value in any allowed attribute (class, style, title, alt, src, href) can include a double-quote character to break out of the attribute and inject an additional attribute, such as a JavaScript event handler (for example onmouseover or onerror). The injected handler survives sanitization and executes when the output is rendered, which is a sanitizer bypass leading to cross-site scripting. The fix in version 0.4.3 HTML-entity-encodes attribute values before serialization.","state":0,"publishedAt":"2026-09-24T18:17:16.64+00:00","modifiedAt":"2026-09-30T17:32:07.107+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1,"severity":"MEDIUM"}],"references":["https://github.com/cstigler/node-xhtml-purifier/commit/21d461ad23e7bc9b3073693d5b51b9b8662044d3","https://github.com/cstigler/node-xhtml-purifier/security/advisories/GHSA-j8r4-32c5-33rc"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-61784","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-79","CWE-116"],"productCriteria":[],"sourceDates":{"published":"2026-09-24T18:17:16.640","lastModified":"2026-09-30T17:32:07.107"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-61784","identifiers":["CVE-2026-61784"]},"retained":false,"historicalAffected":[]}],"coverage":[]}