CVE Catalog

CVE-2026-104828

HighCVSS 7.2
Published: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.26%

17th percentile - higher than 17% of all known CVEs

Summary

HtmlUnit Neko is an HtmlUnit adaptation of NekoHTML. Prior to 5.4.0, HTMLWriterFilter writes decoded TEXTAREA and TITLE character content without entity encoding because both elements are treated as special content. During a parse-and-serialize round trip, entity references inside these escapable raw-text elements are decoded by the parser and then emitted as raw markup, changing the document's semantics.

Risk Assessment

Applications using htmlunit-neko in an HTML sanitizer or content filter can turn attacker-controlled encoded text into executable markup, leading to XSS when rendered by a browser.

Recommendation

Upgrade htmlunit-neko to version 5.4.0 or later.

Related vulnerabilities

Original NVD description (English source)

HtmlUnit Neko is an HtmlUnit adaptation of NekoHTML. Prior to 5.4.0, HTMLWriterFilter writes decoded TEXTAREA and TITLE character content without entity encoding because both elements are treated as special content. During a parse-and-serialize round trip, entity references inside these escapable raw-text elements are decoded by the parser and then emitted as raw markup by printCharacters(), changing the document's semantics. Applications that use htmlunit-neko in an HTML sanitizer, content filter, or other parse-transform-serialize pipeline can therefore turn attacker-controlled encoded text into executable markup when the output is rendered by a browser. This issue is fixed in version 5.4.0.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS