CVE-2026-10054
- Source
- https://cve.org/CVERecord?id=CVE-2026-10054
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-10054.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-10054
- Aliases
-
- GHSA-78g8-vm3p-97c6
- Published
- 2026-07-03T10:11:32Z
- Modified
- 2026-08-12T03:51:25Z
- Severity
-
- 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
In affected versions of Eclipse Theia (1.8.1 and later), the browser backend exposes privileged terminal RPC over WebSocket (/services/shell-terminal, /services/terminals/:id) without service-level authentication.
WebSocket origin validation in @theia/core is fail-open: connections are accepted when the Origin header is missing or when no THEIA_HOSTS allowlist is configured (the default). The Socket.IO integration additionally replaces the real Origin header with a client-supplied fix-origin header that an attacker can control or omit.
As a result, a foreign-origin web page visited by a user with a running Theia instance can open the /services WebSocket namespace, invoke terminal creation, attach to the resulting terminal data channel, execute arbitrary OS commands, and read their output. This affects both local developer setups (drive-by attack) and hosted or tunneled deployments without strong external authentication.
A fix is in development that enforces same-origin validation by default, removes trust in the fix-origin header, gates HTTP and WebSocket access on a SameSite=Strict; HttpOnly connection-token cookie, and sanitizes shell terminal creation options.
- Database specific
{ "cna_assigner": "eclipse", "cwe_ids": [ "CWE-1385", "CWE-306" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/10xxx/CVE-2026-10054.json" }- References