CVE-2026-61784: cstigler node-xhtml-purifier, XSS

Описание

Оригинално описание

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.

Засегнати продукти

• cstigler node-xhtml-purifier: < 0.4.3

Вид слабост

• CWE-79 XSS
• CWE-116 Неправилно кодиране или екраниране на изходни данни

История

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-61784
• https://nvd.nist.gov/vuln/detail/CVE-2026-61784
• https://github.com/cstigler/node-xhtml-purifier/security/advisories/GHSA-j8r4-32c5-33rc
• https://github.com/cstigler/node-xhtml-purifier/commit/21d461ad23e7bc9b3073693d5b51b9b8662044d3