Description
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).
Published: 2026-07-03
Score: 8.5 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Tue, 07 Jul 2026 19:45:00 +0000

Type Values Removed Values Added
Title Eclipse Theia Server‑Side Request Forgery Exposing Internal Resources

Mon, 06 Jul 2026 19:30:00 +0000

Type Values Removed Values Added
Title Eclipse Theia Server‑Side Request Forgery Exposing Internal Resources

Mon, 06 Jul 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 06 Jul 2026 13:30:00 +0000

Type Values Removed Values Added
Title Server‑Side Request Forgery in Eclipse Theia Exposing Internal Resources

Mon, 06 Jul 2026 01:30:00 +0000

Type Values Removed Values Added
Title Server‑Side Request Forgery in Eclipse Theia Exposing Internal Resources

Sun, 05 Jul 2026 17:15:00 +0000

Type Values Removed Values Added
Title Server‑Side Request Forgery via /services/request-service in Eclipse Theia

Sun, 05 Jul 2026 09:15:00 +0000

Type Values Removed Values Added
Title Server‑Side Request Forgery via /services/request-service in Eclipse Theia

Sun, 05 Jul 2026 01:15:00 +0000

Type Values Removed Values Added
Title Server‑Side Request Forgery in Eclipse Theia Allows Internal Resource Exposure

Sat, 04 Jul 2026 17:15:00 +0000

Type Values Removed Values Added
Title Server‑Side Request Forgery in Eclipse Theia Allows Internal Resource Exposure

Sat, 04 Jul 2026 12:45:00 +0000

Type Values Removed Values Added
Title Unrestricted Server‑Side Request Forgery in Eclipse Theia

Sat, 04 Jul 2026 01:15:00 +0000

Type Values Removed Values Added
Title Unrestricted Server‑Side Request Forgery in Eclipse Theia

Fri, 03 Jul 2026 15:15:00 +0000

Type Values Removed Values Added
First Time appeared Eclipse
Eclipse theia
Vendors & Products Eclipse
Eclipse theia

Fri, 03 Jul 2026 11:00:00 +0000

Type Values Removed Values Added
Description 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).
Weaknesses CWE-200
CWE-918
References
Metrics cvssV3_1

{'score': 8.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: eclipse

Published:

Updated: 2026-07-06T15:23:38.516Z

Reserved: 2026-05-29T07:38:29.233Z

Link: CVE-2026-10055

cve-icon Vulnrichment

Updated: 2026-07-06T15:23:34.458Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-08T11:15:04Z

Weaknesses