What’s Vulnerable › Vulnerabilities

CVE-2019-18213

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-10-23 · updated 2026-06-17
• Weakness: CWE-611

Description

XML Language Server (aka lsp4xml) before 0.9.1, as used in Red Hat XML Language Support (aka vscode-xml) before 0.9.1 for Visual Studio and other products, allows XXE via a crafted XML document, with resultant SSRF (as well as SMB connection initiation that can lead to NetNTLM challenge/response capture for password cracking). This occurs in extensions/contentmodel/participants/diagnostics/LSPXMLParserConfiguration.java.

Affected products

• eclipse Wild Web Developer: all versions
• Theia Xml Extension Project Theia Xml Extension: all versions
• Xml Language Server Project Xml Server Project: before 0.9.1 — fixed in 0.9.1

How to fix

Upgrade to a fixed version: Xml Language Server Project Xml Server Project 0.9.1. Check the vendor advisory for mitigations.

References

• https://github.com/angelozerr/lsp4xml/
• https://github.com/angelozerr/lsp4xml/blob/master/CHANGELOG.md#others
• https://github.com/angelozerr/lsp4xml/pull/566
• https://github.com/redhat-developer/vscode-xml/
• https://marketplace.visualstudio.com/items?itemName=redhat.vscode-xml
• https://www.shielder.it/blog/dont-open-that-xml-xxe-to-rce-in-xml-plugins-for-vs-code-eclipse-theia/
• https://github.com/angelozerr/lsp4xml/
• https://github.com/angelozerr/lsp4xml/blob/master/CHANGELOG.md#others
• https://github.com/angelozerr/lsp4xml/pull/566
• https://github.com/redhat-developer/vscode-xml/
• https://marketplace.visualstudio.com/items?itemName=redhat.vscode-xml
• https://www.shielder.it/blog/dont-open-that-xml-xxe-to-rce-in-xml-plugins-for-vs-code-eclipse-theia/

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