{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-10054","assignerOrgId":"e51fbebd-6053-4e49-959f-1b94eeb69a2c","state":"PUBLISHED","assignerShortName":"eclipse","dateReserved":"2026-05-29T07:35:37.279Z","datePublished":"2026-07-03T10:11:32.446Z","dateUpdated":"2026-07-07T03:56:07.775Z"},"containers":{"cna":{"providerMetadata":{"orgId":"e51fbebd-6053-4e49-959f-1b94eeb69a2c","shortName":"eclipse","dateUpdated":"2026-07-03T10:11:32.446Z"},"problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-1385","description":"CWE-1385 Missing origin validation in WebSockets","type":"CWE"}]},{"descriptions":[{"lang":"en","cweId":"CWE-306","description":"CWE-306 Missing authentication for critical function","type":"CWE"}]}],"impacts":[{"capecId":"CAPEC-111","descriptions":[{"lang":"en","value":"CAPEC-111 JSON Hijacking (aka JavaScript Hijacking)"}]},{"capecId":"CAPEC-62","descriptions":[{"lang":"en","value":"CAPEC-62 Cross Site Request Forgery"}]}],"affected":[{"vendor":"Eclipse Foundation","product":"Eclipse Theia","versions":[{"status":"affected","version":"1.8.1","lessThan":"1.73.0","versionType":"semver"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","value":"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.\n\n\n\n\nWebSocket 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.\n\n\n\n\nAs 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.\n\n\n\n\nA 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.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>In affected versions of Eclipse Theia (1.8.1 and later), the browser backend exposes privileged terminal RPC over WebSocket (<code>/services/shell-terminal</code>, <code>/services/terminals/:id</code>) without service-level authentication.</p>\n<p>WebSocket origin validation in <code>@theia/core</code> is fail-open: connections are accepted when the <code>Origin</code> header is missing or when no <code>THEIA_HOSTS</code> allowlist is configured (the default). The Socket.IO integration additionally replaces the real <code>Origin</code> header with a client-supplied <code>fix-origin</code> header that an attacker can control or omit.</p>\n<p>As a result, a foreign-origin web page visited by a user with a running Theia instance can open the <code>/services</code> 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.</p>\n<p>A fix is in development that enforces same-origin validation by default, removes trust in the <code>fix-origin</code> header, gates HTTP and WebSocket access on a <code>SameSite=Strict; HttpOnly</code> connection-token cookie, and sanitizes shell terminal creation options.</p>"}]}],"references":[{"url":"https://github.com/eclipse-theia/theia/security/advisories/GHSA-78g8-vm3p-97c6"},{"url":"https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/376"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseSeverity":"HIGH","baseScore":8.8,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}}],"credits":[{"lang":"en","value":"Anwar Ayoob","type":"reporter"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.2"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-06T00:00:00+00:00","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3","id":"CVE-2026-10054"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-07T03:56:07.775Z"}}]}}