TI-2026-42788 Aliases CVE-2026-60009 GHSA-2mw2-h8hj-xpjg

Path traversal in Eclipse Theia

MEDIUM 40CWE-22Published 2026-08-05 · Updated 2026-08-05

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Security bypass, Tampering
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-306 and CWE-352.

Summary

In Eclipse Theia versions up to and including 1.73.1, the `@theia/filesystem` backend binds `POST /file-upload` in every filesystem-enabled deployment. The handler takes an attacker-supplied absolute path from the multipart `uri` field and calls `fs.move(tmp, target, { overwrite: true })` with no workspace confinement and no authentication. In browser (non-Electron) deployments the connection token is enforced only on WebSocket upgrades; the HTTP middleware in `@theia/core` re-issues the cookie and calls `next()` without rejecting tokenless HTTP requests. Because `multipart/form-data` is a CORS-safelisted request type, a cross-origin web page can trigger the write with no preflight and no credentials, resulting in an unauthenticated arbitrary file write outside the workspace to any absolute path the backend process can write. This can escalate to remote code execution, for example by overwriting a startup-executed file such as `~/.bashrc`. Electron mode uses a separate `ElectronSecurityToken` and is not affected via this path.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00444 38th percentileScored 2026-11-07

Public exploit Yes 2 exploit referencesTagged by NVD

Fix Fixed Eclipse Theia (Eclipse Foundation): 1.74.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Eclipse Foundation	Eclipse Theia	before 1.74.0	1.74.0	Patch available	CNA

Eclipse Theia VendorEclipse Foundation Affected before 1.74.0 Fixed in 1.74.0 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:eclipse:theia::::::::	before 1.74.0	Vulnerable	Eclipse Foundation

cpe:2.3:a:eclipse:theia:*:*:*:*:*:*:*:* Versions before 1.74.0 Vulnerable ·Eclipse Foundation

Remediation

Fix · CNA Eclipse Theia (Eclipse Foundation) Fixed in 1.74.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-08-05
Eclipse Theia 1.74.0
4 records Highest priority Priority MEDIUM 4 MEDIUM
Other records, highest priority first
- TI-2026-12294 Prototype pollution in Eclipse TheiaPriority MEDIUM 59
- TI-2026-10807 Path traversal in Eclipse TheiaPriority MEDIUM 42
- TI-2026-44283 Information disclosure in Eclipse TheiaPriority MEDIUM 40
Show all 4 records →

Timeline

2026-10-02 Threatist record created from CVE-2026-60009
2026-10-03 Alias added: GHSA-2mw2-h8hj-xpjg

References

Exploit 2

Advisory 1

https://gitlab.eclipse.org/security/cve-assignment/-/work_items/177

Other 1

https://github.com/eclipse-theia/theia/security/advisories/GHSA-62f6-wcvg-54h3

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-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-2026-34242 In Eclipse Theia versions prior to 1.71.0, files matching the pattern… CVSS 4.0HIGH 8.4

See all 14 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences