{"id":"CVE-2026-61891","state":"PUBLISHED","title":"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 ","description":"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.","publishedAt":"2026-08-05T11:03:01.669Z","updatedAt":"2026-08-05T12:35:46.717Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","source":"eclipse"},"assigner":"eclipse","products":["Eclipse Foundation Eclipse Theia"],"affected":[{"vendor":"Eclipse Foundation","product":"Eclipse Theia","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.74.0","versionType":"semver"}]}],"references":["https://github.com/eclipse-theia/theia/security/advisories/GHSA-qqc8-9538-25v4","https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/570","https://gitlab.eclipse.org/security/cve-assignment/-/work_items/176"],"weaknesses":["CWE-22","CWE-36","CWE-200","CWE-306"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/61xxx/CVE-2026-61891.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-61891","state":"PUBLISHED","datePublished":"2026-08-05T11:03:01.669Z","dateUpdated":"2026-08-05T12:35:46.717Z","assignerShortName":"eclipse","assignerOrgId":"e51fbebd-6053-4e49-959f-1b94eeb69a2c","dateReserved":"2026-07-15T08:43:52.463Z"},"containers":{"cna":{"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."}],"affected":[{"vendor":"Eclipse Foundation","product":"Eclipse Theia","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.74.0","versionType":"semver"}]}],"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"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-22","lang":"en","description":"CWE-22","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-36","lang":"en","description":"CWE-36","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-200","lang":"en","description":"CWE-200","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-306","lang":"en","description":"CWE-306","type":"CWE"}]}],"providerMetadata":{"shortName":"eclipse","orgId":"e51fbebd-6053-4e49-959f-1b94eeb69a2c","dateUpdated":"2026-08-05T11:03:01.669Z"},"impacts":[{"capecId":"CAPEC-126","descriptions":[{"lang":"en","value":"CAPEC-126"}]},{"capecId":"CAPEC-597","descriptions":[{"lang":"en","value":"CAPEC-597"}]}],"credits":[{"lang":"en","value":"Christian Damus (http://github.com/cdamus, https://gitlab.eclipse.org/cdamus)","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.4"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-05T12:34:58.985421Z","id":"CVE-2026-61891","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-05T12:35:46.717Z"}}]}}}