What’s Vulnerable › Vulnerabilities

CVE-2023-49093: HtmlUnit vulnerable to Remote Code Execution (RCE) via XSTL

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-12-04 · updated 2026-06-17
• Weakness: CWE-94

Description

HtmlUnit is a GUI-less browser for Java programs. HtmlUnit is vulnerable to Remote Code Execution (RCE) via XSTL, when browsing the attacker’s webpage. This vulnerability has been patched in version 3.9.0

Affected products

• net.sourceforge.htmlunit:htmlunit: before 3.9.0 — fixed in 3.9.0

How to fix

Upgrade to a fixed version: net.sourceforge.htmlunit:htmlunit 3.9.0. Check the vendor advisory for mitigations.

References

• https://github.com/HtmlUnit/htmlunit/security/advisories/GHSA-37vq-hr2f-g7h7
• https://www.htmlunit.org/changes-report.html#a3.9.0
• https://github.com/HtmlUnit/htmlunit/security/advisories/GHSA-37vq-hr2f-g7h7
• https://www.htmlunit.org/changes-report.html#a3.9.0

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