---
id: CVE-2023-26119
title: >-
  Versions of the package net.sourceforge.htmlunit:htmlunit from 0 and before
  3.0.0 are vulnerable to Remote Code Execution (RCE) via XSTL, when browsing
  the attacker’s webpage.
summary: >-
  Versions of the package net.sourceforge.htmlunit:htmlunit from 0 and before
  3.0.0 are vulnerable to Remote Code Execution (RCE) via XSTL, when browsing
  the attacker’s webpage.
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-94
vendor: htmlunit
product: htmlunit
affected:
  - htmlunit < 3.0.0
patched:
  - htmlunit 3.0.0
published: '2023-04-03'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T22:17:23.163'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-26119'
references:
  - url: >-
      https://github.com/HtmlUnit/htmlunit/commit/641325bbc84702dc9800ec7037aec061ce21956b
    label: report@snyk.io
  - url: 'https://security.snyk.io/vuln/SNYK-JAVA-NETSOURCEFORGEHTMLUNIT-3252500'
    label: report@snyk.io
  - url: 'https://siebene.github.io/2022/12/30/HtmlUnit-RCE/'
    label: report@snyk.io
  - url: >-
      https://github.com/HtmlUnit/htmlunit/commit/641325bbc84702dc9800ec7037aec061ce21956b
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.snyk.io/vuln/SNYK-JAVA-NETSOURCEFORGEHTMLUNIT-3252500'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://siebene.github.io/2022/12/30/HtmlUnit-RCE/'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.02513
epssPercentile: 0.84312
ingestedAt: '2026-10-08T23:16:47.349Z'
---

## Overview

Versions of the package net.sourceforge.htmlunit:htmlunit from 0 and before 3.0.0 are vulnerable to Remote Code Execution (RCE) via XSTL, when browsing the attacker’s webpage.

## Affected

- `htmlunit < 3.0.0`

## Remediation

Upgrade past the affected range:

- `htmlunit 3.0.0`