Path traversal in Eclipse Theia
Priority MEDIUM 46CWE-22Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
In Eclipse Theia 0.1.1 to 0.2.0, it is possible to exploit the default build to obtain remote code execution (and XXE) via the theia-xml-extension. This extension uses lsp4xml (recently renamed to LemMinX) in order to provide language support for XML. This is installed by default.
Why it matters now
EPSS 0.02223 82nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
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 | 0.1.1; 0.1.2; 0.2.0-next.28bc2735; 0.2.0-next.41406d98; 0.2.0-next.a2958907 | — | No fix listed | CNA |
- Eclipse Theia VendorEclipse Foundation Affected 0.1.1; 0.1.2; 0.2.0-next.28bc2735; 0.2.0-next.41406d98; 0.2.0-next.a2958907 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:eclipse:theia:*:*:*:*:*:*:*:* | 0.1.1 – 0.2.0 | Vulnerable | Eclipse Foundation |
- cpe:2.3:a:eclipse:theia:*:*:*:*:*:*:*:* Versions 0.1.1 – 0.2.0 Vulnerable ·Eclipse Foundation
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-34436
- 2026-10-03 Alias added: GHSA-8gpx-73gc-wq7c
References
More Eclipse Foundation Theia vulnerabilities
- TI-2026-12294 Prototype pollution in Eclipse Theia CVSS 4.0MEDIUM 5.7
- TI-2020-16550 Cross-site scripting in Eclipse Theia CVSS 3.1CRITICAL 9.6
- 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-2021-34436 · CVE Program
- CVE-2021-34436 · NVD
- FIRST EPSS
- GHSA-8gpx-73gc-wq7c · GitHub Advisory Database · CC BY 4.0
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