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CVE-2021-41038

21
FAUCET Score

CVE-2021-41038 describes a vulnerability in the @theia/plugin-ext component of Eclipse Theia versions prior to 1.18.0, allowing Webview content hijacking through postMessage(). This medium-severity vulnerability (CVSS 6.1) requires user interaction and network access, potentially leading to limited confidentiality and integrity impacts. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.18.0CPE 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
0.71%
Probability of exploitation in next 30 days
EPSS Percentile
49.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0071 is in the 56th percentile among its peer group of 26,236 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 (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: @theia/plugin-extFixed in: 1.18.0

Vendor Advisories (1)

npmGHSA-w6v7-w58j-pg5rmedium

Improper Verification of Communication Channel in @theia/plugin-ext

Nov 15, 2021

References

bugs.eclipse.org / bugs/show_bug.cgi
ExploitIssue TrackingThird Party Advisory
github.com / eclipse-theia/theia/pull/10125
PatchThird Party Advisory