CVE-2021-34435

PoC —

CVSS 3.1

8.8 high

EPSS

<1%p47

Published

Sep 1, 2021 (Sep 1, 2021)

Modified

Jun 17, 2026

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..

Vendors: eclipse
Products: theia
Weakness: CWE-942, CWE-346
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (0.6%)

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