Cross-site Scripting (XSS) in Eclipse Theia

Description

In Eclipse Theia versions up to and including 1.2.0, the Markdown Preview (@theia/preview), can be exploited to execute arbitrary code.

Recommendation

Update the @theia/preview package to the latest compatible version. Followings are version details:

• Affected version(s): < 1.2.0
• Patched version(s): 1.3.0

References

• GHSA-gcm9-cc3r-c6vj
• omespino.com
• CVE-2020-27224
• CWE-79
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• mpregular vulnerable to prototype pollution - CVE-2025-57323
• DOMPurify allows Cross-site Scripting (XSS) - CVE-2025-26791
• lite-server vulnerable to Denial of Service - CVE-2022-25940
• Manifest Uses a One-Way Hash without a Salt - CVE-2025-27408

Tags:

npm

@theia/preview