CVE-2026-10055

In Eclipse Theia since version 1.26.0, the backend /services/request-service RPC accepts an attacker-controlled URL from any client connected to the standard /services messaging endpoint, performs the HTTP request server-side, and returns the full response body to the caller. Because the destination URL is neither validated nor allowlisted, a remote attacker with access to the Theia service connection can issue server-side HTTP requests to localhost or other backend-reachable hosts and read their responses, exposing internal administrative endpoints, cloud instance metadata services, and other resources that are intentionally outside the browser network boundary. The vulnerability affects deployments where the Theia service connection is reachable by untrusted users (for example, multi-tenant or publicly-reachable Theia deployments).

CVSS v3 8.5 HIGH

8.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.1 / Impact : 4.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/eclipse-theia/theia/security/advisories/GHSA-2m57-xxmh-v696
https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/446

Configurations

No configuration.

History

03 Jul 2026, 11:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-03 11:16

Updated : 2026-07-06 18:56

NVD link : CVE-2026-10055

Mitre link : CVE-2026-10055

CVE.ORG link : CVE-2026-10055

JSON object : View

Products Affected

No product.

CWE

CWE-200

Exposure of Sensitive Information to an Unauthorized Actor

CWE-918

Server-Side Request Forgery (SSRF)

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