{"id":"CVE-2026-61784","revision":null,"records":[{"revision":"26d301e65b80432abe30181ba53eb5e9","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-61784","aliases":[],"title":"xhtml-purifier has HTML attribute-injection (sanitizer bypass) that leads to XSS","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":"2026-09-24T17:35:57.096+00:00","modifiedAt":"2026-09-24T18:03:05.576+00:00","affected":[{"ecosystem":"Vendor product","name":"node-xhtml-purifier","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"cstigler\",\n                    \"product\": \"node-xhtml-purifier\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 0.4.3\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","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/security/advisories/GHSA-j8r4-32c5-33rc","https://github.com/cstigler/node-xhtml-purifier/commit/21d461ad23e7bc9b3073693d5b51b9b8662044d3"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-61784","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-61784","identifiers":["CVE-2026-61784"]},"retained":false,"historicalAffected":[]},{"revision":"5888dada27234a19bee59bc77dc005ea","observedAt":"2026-11-11T15:03:08.939+00:00","statement":{"source":"euvd","id":"EUVD-2026-86325","aliases":["CVE-2026-61784","GHSA-j8r4-32c5-33rc"],"title":"xhtml-purifier is a Node.js library to take in raw/unknown/untrusted HTML and output cleaned, purified, trusted HTML. 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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":[]},{"revision":"2ee839a4551f43698da883a2980b7c07","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-j8r4-32c5-33rc","aliases":["CVE-2026-61784"],"title":"xhtml-purifier has HTML attribute-injection (sanitizer bypass) that leads to XSS","description":"xhtml-purifier does 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. 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The fix HTML-entity-encodes attribute values before serialization.","state":0,"publishedAt":"2026-09-24T19:33:23+00:00","modifiedAt":"2026-09-24T19:45:04.825205+00:00","affected":[{"ecosystem":"npm","name":"xhtml-purifier","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.4.3"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/cstigler/node-xhtml-purifier/security/advisories/GHSA-j8r4-32c5-33rc","https://nvd.nist.gov/vuln/detail/CVE-2026-61784","https://github.com/cstigler/node-xhtml-purifier/pull/6","https://github.com/cstigler/node-xhtml-purifier/commit/21d461ad23e7bc9b3073693d5b51b9b8662044d3","https://github.com/cstigler/node-xhtml-purifier","https://github.com/cstigler/node-xhtml-purifier/releases/tag/v0.4.3"],"sourceUrl":"https://github.com/advisories/GHSA-j8r4-32c5-33rc","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-j8r4-32c5-33rc","identifiers":["GHSA-j8r4-32c5-33rc","CVE-2026-61784"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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