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CVE-2021-28162

21
FAUCET Score

CVE-2021-28162 describes a cross-site scripting (XSS) vulnerability in Eclipse Theia versions up to and including 0.16.0, where notification messages fail to properly escape HTML, allowing arbitrary JavaScript execution. This medium-severity vulnerability (CVSS 6.1) requires user interaction for exploitation, with potential impacts including limited confidentiality and integrity compromise. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.16.0CPE matchmatch criteria
cpe:2.3:a:eclipse:theia:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.78%
Probability of exploitation in next 30 days
EPSS Percentile
52.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0078 is in the 59th percentile among its peer group of 26,219 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

npmpatch availablevia ghsa
Product: @theia/messagesFixed in: 1.0.0

Vendor Advisories (1)

npmGHSA-c94v-8fff-73phmedium

Command Injection in @theia/messages

May 10, 2021

References

github.com / eclipse-theia/theia/issues/7283
ExploitIssue TrackingThird Party Advisory