Server-Side Request Forgery (SSRF) in Eclipse Theia - CVE-2026-10055
Published: July 22, 2026
Vulnerability identifier: #VU139168
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:L/SI:N/SA:N]
CVE-ID: CVE-2026-10055
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to send server-side requests to internal or localhost endpoints and disclose sensitive response data.
The vulnerability exists due to server-side request forgery in the /services/request-service RPC when handling an attacker-controlled URL through the standard /services messaging endpoint. A remote user can invoke the RPC with a crafted URL to send server-side requests to internal or localhost endpoints and disclose sensitive response data.
The full response body is returned to the caller base64-encoded, and the issue is reachable through the standard frontend/backend connection without special configuration for the affected RPC.
Affected software
Eclipse Theia
How to mitigate CVE-2026-10055
Install security update from vendor's website.
Eclipse Theia - update to 1.73.0