What’s Vulnerable › Vulnerabilities

CVE-2021-41038

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-11-10 · updated 2026-06-17
• Weakness: CWE-940

Description

In versions of the @theia/plugin-ext component of Eclipse Theia prior to 1.18.0, Webview contents can be hijacked via postMessage().

Affected products

• Eclipse Foundation Eclipse Theia: before 1.18.0 — fixed in 1.18.0

How to fix

Upgrade to a fixed version: Eclipse Foundation Eclipse Theia 1.18.0. Check the vendor advisory for mitigations.

References

• https://bugs.eclipse.org/bugs/show_bug.cgi?id=575924
• https://github.com/eclipse-theia/theia/pull/10125
• https://bugs.eclipse.org/bugs/show_bug.cgi?id=575924
• https://github.com/eclipse-theia/theia/pull/10125

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