{"id":"CVE-2026-60009","published":"2026-08-05T11:16:25.363","lastModified":"2026-08-07T15:54:02.380","description":"In Eclipse Theia versions up to and including 1.73.1, the `@theia/filesystem` backend binds `POST /file-upload` in every filesystem-enabled deployment. The handler takes an attacker-supplied absolute path from the multipart `uri` field and calls `fs.move(tmp, target, { overwrite: true })` with no workspace confinement and no authentication. 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. Because `multipart/form-data` is a CORS-safelisted request type, a cross-origin web page can trigger the write with no preflight and no credentials, resulting in an unauthenticated arbitrary file write outside the workspace to any absolute path the backend process can write. This can escalate to remote code execution, for example by overwriting a startup-executed file such as `~/.bashrc`. Electron mode uses a separate `ElectronSecurityToken` and is not affected via this path.","cvssScore":8.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwes":["CWE-22","CWE-73","CWE-306","CWE-352"],"vendors":["eclipse"],"products":["theia"],"references":[{"url":"https://github.com/eclipse-theia/theia/security/advisories/GHSA-62f6-wcvg-54h3","tags":["Broken Link"]},{"url":"https://gitlab.eclipse.org/security/cve-assignment/-/work_items/177","tags":["Vendor Advisory"]},{"url":"https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/595","tags":["Exploit","Mitigation","Vendor Advisory"]},{"url":"https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/595","tags":["Exploit","Mitigation","Vendor Advisory"]}],"exploitRefs":[{"url":"https://github.com/eclipse-theia/theia/security/advisories/GHSA-62f6-wcvg-54h3","tags":["Broken Link"]},{"url":"https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/595","tags":["Exploit","Mitigation","Vendor Advisory"]},{"url":"https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/595","tags":["Exploit","Mitigation","Vendor Advisory"]}],"hasPoc":true,"ai":{"summary":"The flaw allows an attacker to perform unauthenticated arbitrary file writes outside the workspace, potentially leading to remote code execution.","exploitability":"Exploitation is relatively easy given that a cross-origin web page can trigger the write with no preflight and no credentials. Precondition is a browser with access to the target filesystem.","blast_radius":"If exploited, the impact could be severe, allowing an attacker to overwrite critical files and potentially execute arbitrary code.","remediation":"Upgrade to Theia version 1.74 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","web","file-write","unauthenticated"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-30T09:19:34.784Z"}}