What is CVE-2021-28162?

CVE-2021-28162 is a medium-severity vulnerability in Eclipse Theia, classified under CWE-830. CVSS score: 6.1/10. Published 2021-03-12.

How severe is CVE-2021-28162?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2021-28162 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Eclipse Theia

CVE-2021-28162

In Eclipse Theia versions up to and including 0.16.0, in the notification messages there is no HTML escaping, so Javascript code can run.

Published 2021-03-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (54.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Eclipse Theia
The Eclipse Foundation Theia — versions unspecified

Weakness classification (CWE)

Public proof-of-concept exploits

References

github.com/eclipse-theia/theia/issues/7283 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-28162?: CVE-2021-28162 is a medium-severity vulnerability in Eclipse Theia, classified under CWE-830. CVSS score: 6.1/10. Published 2021-03-12.
How severe is CVE-2021-28162?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-28162 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.