{"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). 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{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-10054", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-07-06T14:18:28.199629Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-06T14:18:35.722Z"}}], "cna": {"source": {"discovery": "UNKNOWN"}, "credits": [{"lang": "en", "type": "reporter", "value": "Anwar Ayoob"}], "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"}]}], "metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "Eclipse Foundation", "product": "Eclipse Theia", "versions": [{"status": "affected", "version": "1.8.1", "lessThan": "1.73.0", "versionType": "semver"}], "defaultStatus": "unaffected"}], "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"}], "x_generator": {"engine": "Vulnogram 1.0.2"}, "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). 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