{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Eclipse Theia",
          "vendor": "Eclipse Foundation",
          "versions": [
            {
              "lessThan": "1.73.0",
              "status": "affected",
              "version": "1.8.1",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Anwar Ayoob"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eIn affected versions of Eclipse Theia (1.8.1 and later), the browser backend exposes privileged terminal RPC over WebSocket (\u003ccode\u003e/services/shell-terminal\u003c/code\u003e, \u003ccode\u003e/services/terminals/:id\u003c/code\u003e) without service-level authentication.\u003c/p\u003e\n\u003cp\u003eWebSocket origin validation in \u003ccode\u003e@theia/core\u003c/code\u003e is fail-open: connections are accepted when the \u003ccode\u003eOrigin\u003c/code\u003e header is missing or when no \u003ccode\u003eTHEIA_HOSTS\u003c/code\u003e allowlist is configured (the default). The Socket.IO integration additionally replaces the real \u003ccode\u003eOrigin\u003c/code\u003e header with a client-supplied \u003ccode\u003efix-origin\u003c/code\u003e header that an attacker can control or omit.\u003c/p\u003e\n\u003cp\u003eAs a result, a foreign-origin web page visited by a user with a running Theia instance can open the \u003ccode\u003e/services\u003c/code\u003e 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.\u003c/p\u003e\n\u003cp\u003eA fix is in development that enforces same-origin validation by default, removes trust in the \u003ccode\u003efix-origin\u003c/code\u003e header, gates HTTP and WebSocket access on a \u003ccode\u003eSameSite=Strict; HttpOnly\u003c/code\u003e connection-token cookie, and sanitizes shell terminal creation options.\u003c/p\u003e"
            }
          ],
          "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."
        }
      ],
      "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": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1385",
              "description": "CWE-1385 Missing origin validation in WebSockets",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-306",
              "description": "CWE-306 Missing authentication for critical function",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-03T10:11:32.446Z",
        "orgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c",
        "shortName": "eclipse"
      },
      "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"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "x_generator": {
        "engine": "Vulnogram 1.0.2"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c",
    "assignerShortName": "eclipse",
    "cveId": "CVE-2026-10054",
    "datePublished": "2026-07-03T10:11:32.446Z",
    "dateReserved": "2026-05-29T07:35:37.279Z",
    "dateUpdated": "2026-07-03T10:11:32.446Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}