CVE-2026-104828 HtmlUnit Neko - Stored XSS

HtmlUnit Neko < 5.4.0 contains a stored XSS caused by improper entity encoding in TEXTAREA and TITLE elements during parse-and-serialize, letting attackers inject executable markup, exploit requires attacker-controlled input.

CVSS base score 7.2 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Stored Xss
Impact
Stored Xss
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Published
15 October 2026
Updated
16 October 2026
Weakness
CWE-79

Vendor fix

Upgrade to version 5.4.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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