VULNERABILITY INTELLIGENCE

CVE-2021-34435

CVSS score8.8 HIGH

EPSS probability0.60%

CISA KEVNot currently listed

Published2021-09-01

Last modified2026-06-17

Description

In Eclipse Theia 0.3.9 to 1.8.1, the "mini-browser" extension allows a user to preview HTML files in an iframe inside the IDE. But with the way it is made it is possible for a previewed HTML file to trigger an RCE. This exploit only happens if a user previews a malicious file..