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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-61891 Detail

Description

In Eclipse Theia versions up to and including 1.73.1, the `@theia/filesystem` backend exposes HTTP file-download endpoints (`GET /file`, `GET /files/`, `PUT /files/`) that convert a client-supplied URI directly to a filesystem path and stream the file, without confining it to the workspace or any allow-listed root. 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, so these endpoints are reachable without a valid token. As a result an unauthenticated client can read any file readable by the backend process, including files outside the opened workspace (for example `/etc/hosts`, SSH keys, or tokens). Electron mode uses a separate `ElectronSecurityToken` and is not affected via this path.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/eclipse-theia/theia/security/advisories/GHSA-qqc8-9538-25v4 Eclipse Foundation
https://gitlab.eclipse.org/security/cve-assignment/-/work_items/176 Eclipse Foundation
https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/570 Eclipse Foundation

Weakness Enumeration

CWE-ID CWE Name Source
CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') Eclipse Foundation  
CWE-36 Absolute Path Traversal Eclipse Foundation  
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor Eclipse Foundation  
CWE-306 Missing Authentication for Critical Function Eclipse Foundation  

Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-61891
NVD Published Date:
08/05/2026
NVD Last Modified:
08/05/2026
Source:
Eclipse Foundation