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CVE-2026-61891

Published: Aug 5, 2026Updated: Aug 7, 2026 Sources: CVE List NVDCWE-22
7.5HIGH
NVD MITRE
EPSS Score
0.5%
Top 63.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-22CWE-36CWE-200CWE-306

Affected Products

Eclipse Foundation
oss-project·DE
Eclipse Theia
OSS Libraries
eclipse
oss-project·BEaka eclipse-foundation
theia
DevTools & CI

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

4 techniques
Collection
Discovery
Initial Access
View detailed technique mapping

References

https://github.com/eclipse-theia/theia/security/advisories/GHSA-qqc8-9538-25v4
github.com
https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/570
gitlab.eclipse.org
https://gitlab.eclipse.org/security/cve-assignment/-/work_items/176
gitlab.eclipse.org

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