What is CVE-2021-34435?

CVE-2021-34435 is a high-severity vulnerability in Eclipse Theia, classified under Permissive Cross-domain Policy with Untrusted Domains. CVSS score: 8.8/10. Published 2021-09-01.

How severe is CVE-2021-34435?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Eclipse Theia

CVE-2021-34435

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 happen…

EPSS: 0.006 (44.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Eclipse Theia
The Eclipse Foundation Theia — versions 0.3.9, unspecified

Weakness classification (CWE)

CWE-942 — Permissive Cross-domain Policy with Untrusted Domains
CWE-346 — Origin Validation Error

References

emo@eclipse.org (x_refsource_CONFIRM, Exploit, Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2021-34435?: CVE-2021-34435 is a high-severity vulnerability in Eclipse Theia, classified under Permissive Cross-domain Policy with Untrusted Domains. CVSS score: 8.8/10. Published 2021-09-01.
How severe is CVE-2021-34435?: High severity. CVSS v3 base score is 8.8 out of 10.