cve.bz

CVE-2021-34435

8.8 highEPSS 0.6%

High (8.8) in eclipse theia. EPSS 0.6% chance of exploitation in the next 30 days. Fixed in @theia/mini-browser 1.9.0.

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..

Severity

CVSS 3.1

8.8 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
0.6% chance of exploitation in the next 30 days; higher than 48% of CVEs (scores of 2026-10-31)
CWEs
CWE-346, CWE-942
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-v9w2-v7j9-rjprnpm@theia/mini-browser>=0.3.9 <1.9.01.9.0

References

Check your stackJSON