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    "cveMetadata": {
        "cveId": "CVE-2026-61891",
        "assignerOrgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c",
        "state": "PUBLISHED",
        "assignerShortName": "eclipse",
        "dateReserved": "2026-07-15T08:43:52.463Z",
        "datePublished": "2026-08-05T11:03:01.669Z",
        "dateUpdated": "2026-08-05T12:35:46.717Z"
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        "cna": {
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                "orgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c",
                "shortName": "eclipse",
                "dateUpdated": "2026-08-05T11:03:01.669Z"
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            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-22",
                            "description": "CWE-22",
                            "type": "CWE"
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                },
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-36",
                            "description": "CWE-36",
                            "type": "CWE"
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                },
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                            "lang": "en",
                            "cweId": "CWE-200",
                            "description": "CWE-200",
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                            "lang": "en",
                            "cweId": "CWE-306",
                            "description": "CWE-306",
                            "type": "CWE"
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            "impacts": [
                {
                    "capecId": "CAPEC-126",
                    "descriptions": [
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                            "lang": "en",
                            "value": "CAPEC-126"
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                },
                {
                    "capecId": "CAPEC-597",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-597"
                        }
                    ]
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            ],
            "affected": [
                {
                    "vendor": "Eclipse Foundation",
                    "product": "Eclipse Theia",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0",
                            "lessThan": "1.74.0",
                            "versionType": "semver"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In Eclipse Theia versions up to and including 1.73.1, the `@theia/filesystem` backend exposes HTTP file-download endpoints (`GET /file`, `GET /files/`, `PUT /files/`) that convert a client-supplied URI directly to a filesystem path and stream the file, without confining it to the workspace or any allow-listed root. In browser (non-Electron) deployments the connection token is enforced only on WebSocket upgrades; the HTTP middleware in `@theia/core` re-issues the cookie and calls `next()` without rejecting tokenless HTTP requests, so these endpoints are reachable without a valid token. As a result an unauthenticated client can read any file readable by the backend process, including files outside the opened workspace (for example `/etc/hosts`, SSH keys, or tokens). Electron mode uses a separate `ElectronSecurityToken` and is not affected via this path.",
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                            "type": "text/html",
                            "base64": false,
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                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://github.com/eclipse-theia/theia/security/advisories/GHSA-qqc8-9538-25v4"
                },
                {
                    "url": "https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/570"
                },
                {
                    "url": "https://gitlab.eclipse.org/security/cve-assignment/-/work_items/176"
                }
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                        "version": "3.1",
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "NONE",
                        "availabilityImpact": "NONE",
                        "baseSeverity": "HIGH",
                        "baseScore": 7.5,
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
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            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "Christian Damus (http://github.com/cdamus, https://gitlab.eclipse.org/cdamus)",
                    "type": "finder"
                }
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            "source": {
                "discovery": "UNKNOWN"
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        "adp": [
            {
                "metrics": [
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                                "timestamp": "2026-08-05T12:34:58.985421Z",
                                "id": "CVE-2026-61891",
                                "options": [
                                    {
                                        "Exploitation": "none"
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