Cross-site scripting in Eclipse Theia
Priority MEDIUM 46CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
In Eclipse Theia versions up to and including 1.2.0, the Markdown Preview (@theia/preview), can be exploited to execute arbitrary code.
Why it matters now
EPSS 0.02593 85th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix Fixed @theia/preview (npm): 1.3.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Eclipse Foundation | Eclipse Theia | up to 1.2.0 | — | No fix listed | CNA |
| — | @theia/preview (npm) | before 1.3.0 | 1.3.0 | Patch available | GHSA-gcm9-cc3r-c6vj |
- Eclipse Theia VendorEclipse Foundation Affected up to 1.2.0 Fixed in — No fix listed CNA
- @theia/preview (npm) Vendor— Affected before 1.3.0 Fixed in 1.3.0 Patch available GHSA-gcm9-cc3r-c6vj
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:eclipse:theia:*:*:*:*:*:*:*:* | up to 1.2.0 | Vulnerable | Eclipse Foundation |
- cpe:2.3:a:eclipse:theia:*:*:*:*:*:*:*:* Versions up to 1.2.0 Vulnerable ·Eclipse Foundation
Remediation
- Fix · GHSA-gcm9-cc3r-c6vj @theia/preview (npm) Fixed in 1.3.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2020-27224
- 2026-10-03 Alias added: GHSA-gcm9-cc3r-c6vj
References
Exploit 2
More Eclipse Foundation Theia vulnerabilities
- TI-2026-12294 Prototype pollution in Eclipse Theia CVSS 4.0MEDIUM 5.7
- TI-2021-13470 Path traversal in Eclipse Theia CVSS 3.1CRITICAL 9.8
- TI-2026-10807 Path traversal in Eclipse Theia CVSS 3.1HIGH 7.5
- TI-2026-44283 Information disclosure in Eclipse Theia CVSS 3.1HIGH 7.5
- TI-2026-42788 Path traversal in Eclipse Theia CVSS 3.1HIGH 8.8
- TI-2026-34242 In Eclipse Theia versions prior to 1.71.0, files matching the pattern… CVSS 4.0HIGH 8.4
Sources
- CVE-2020-27224 · CVE Program
- CVE-2020-27224 · NVD
- FIRST EPSS
- GHSA-gcm9-cc3r-c6vj · GitHub Advisory Database · CC BY 4.0
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