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CVE-2020-27224

30
FAUCET Score

CVE-2020-27224 is a critical vulnerability affecting Eclipse Theia versions up to and including 1.2.0, specifically within its Markdown Preview component. This flaw, categorized as a Cross-Site Scripting (CWE-79), allows an unauthenticated attacker to execute arbitrary code remotely with low attack complexity, leading to complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation, public exploit code, or inclusion in CISA's KEV catalog, the vulnerability has garnered significant community discussion, indicating awareness among security researchers.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.2.0CPE matchmatch criteria
cpe:2.3:a:eclipse:theia:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.6CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.35%
Probability of exploitation in next 30 days
EPSS Percentile
81.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0235 is in the 86th percentile among its peer group of 834 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.8 Bluesky, 0.5 Mastodon, and 1.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

npmpatch availablevia ghsa
Product: @theia/previewFixed in: 1.3.0

Vendor Advisories (1)

npmGHSA-gcm9-cc3r-c6vjcritical

Cross-site Scripting (XSS) in Eclipse Theia

Apr 13, 2021

References

github.com / eclipse-theia/theia/issues/7954
ExploitIssue TrackingThird Party Advisory
omespino.com / write-up-google-bug-bounty-xss-to-cloud-shell-instance-takeover-rce-as-root-5000-usd
ExploitThird Party Advisory