{"id":"GO-2026-4960","revision":null,"records":[{"revision":"34bb304e9e954dcca4da8facc68c6bed","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-39386","aliases":[],"title":"Neko has Self-service Privilege Escalation for Authenticated Users","description":"Neko is a a self-hosted virtual browser that runs in Docker and uses WebRTC In versions 3.0.0 through 3.0.10 and 3.1.0 through 3.1.1, any authenticated user can immediately obtain full administrative control of the entire Neko instance (member management, room settings, broadcast control, session termination, etc.). This results in a complete compromise of the instance. The vulnerability has been patched in v3.0.11 and v3.1.2. If upgrading is not immediately possible, the following mitigations can reduce risk: Restrict access to trusted users only (avoid granting accounts to untrusted parties); ensure all user passwords are strong and only shared with trusted individuals; run the instance only when needed; avoid leaving it continuously exposed; place the instance behind authentication layers such as a reverse proxy with additional access controls; disable or restrict access to the /api/profile endpoint if feasible; and/or monitor for suspicious privilege changes or unexpected administrative actions. Note that these are temporary mitigations and do not fully eliminate the vulnerability. 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This results in a complete compromise of the instance. The vulnerability has been patched in v3.0.11 and v3.1.2. If upgrading is not immediately possible, the following mitigations can reduce risk: Restrict access to trusted users only (avoid granting accounts to untrusted parties); ensure all user passwords are strong and only shared with trusted individuals; run the instance only when needed; avoid leaving it continuously exposed; place the instance behind authentication layers such as a reverse proxy with additional access controls; disable or restrict access to the /api/profile endpoint if feasible; and/or monitor for suspicious privilege changes or unexpected administrative actions. Note that these are temporary mitigations and do not fully eliminate the vulnerability. 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This results in a complete compromise of the instance.\n\n### Patches\n\nThe vulnerability has been patched in the following releases:\n\n- [v3.0.11](https://github.com/m1k1o/neko/releases/tag/v3.0.11) (backport release)\n- [v3.1.2](https://github.com/m1k1o/neko/releases/tag/v3.1.2) (latest stable release)\n\nUsers should upgrade to [v3.0.11](https://github.com/m1k1o/neko/releases/tag/v3.0.11) or later (for the 3.0 branch) or [v3.1.2](https://github.com/m1k1o/neko/releases/tag/v3.1.2) or later.\n\n### Workarounds\n\nIf upgrading is not immediately possible, the following mitigations can reduce risk:\n\n- Restrict access to trusted users only (avoid granting accounts to untrusted parties)\n- Run the instance only when needed; avoid leaving it continuously exposed\n- Disable or restrict access to the `/api/profile` endpoint if feasible\n- Monitor for suspicious privilege changes or unexpected administrative actions\n\nNote: These are temporary mitigations and do not fully eliminate the vulnerability. Upgrading is strongly recommended.\n\n### Credits\nNeko thanks @blitzkrieg-patch for responsibly disclosing this vulnerability and reaching out directly. This contribution helped strengthen the project, and the whole community benefits from it.","state":0,"publishedAt":"2026-04-21T17:24:42+00:00","modifiedAt":"2026-06-09T10:52:18+00:00","affected":[{"ecosystem":"Go","name":"github.com/m1k1o/neko/server","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"3.0.0"},{"kind":"fixed","version":"3.0.11"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/m1k1o/neko/server","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.0.0-20250322225643-212bf8a60756"},{"kind":"fixed","version":"0.0.0-20260406184107-c54bcf1ee211"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/m1k1o/neko/security/advisories/GHSA-2gw9-c2r2-f5qf","https://nvd.nist.gov/vuln/detail/CVE-2026-39386","https://github.com/m1k1o/neko/commit/6b561feb9016badea99ae7305091c0ff55e1d114","https://github.com/m1k1o/neko/commit/c54bcf1ee211e28104a2bb6db59583a39c4a4d6e","https://github.com/m1k1o/neko","https://github.com/m1k1o/neko/releases/tag/v3.0.11","https://github.com/m1k1o/neko/releases/tag/v3.1.2"],"sourceUrl":"https://github.com/advisories/GHSA-2gw9-c2r2-f5qf","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-2gw9-c2r2-f5qf","identifiers":["GHSA-2gw9-c2r2-f5qf","CVE-2026-39386","GO-2026-4960"]},"retained":false,"historicalAffected":[]},{"revision":"545a27c82e8845bcb0adf0fb16b462fa","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-4960","aliases":["CVE-2026-39386","GHSA-2gw9-c2r2-f5qf"],"title":"Neko has a Self-service Privilege Escalation for Authenticated Users in github.com/m1k1o/neko/server","description":"Neko has a Self-service Privilege Escalation for Authenticated Users in github.com/m1k1o/neko/server","state":0,"publishedAt":"2026-06-01T21:35:18+00:00","modifiedAt":"2026-06-01T22:00:20.498067+00:00","affected":[{"ecosystem":"Go","name":"github.com/m1k1o/neko/server","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.0.0-20250326225119-51bbad7650d3"},{"kind":"fixed","version":"0.0.0-20260406184107-c54bcf1ee211"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/m1k1o/neko/security/advisories/GHSA-2gw9-c2r2-f5qf","https://github.com/m1k1o/neko/commit/6b561feb9016badea99ae7305091c0ff55e1d114","https://github.com/m1k1o/neko/commit/c54bcf1ee211e28104a2bb6db59583a39c4a4d6e","https://github.com/m1k1o/neko/releases/tag/v3.0.11","https://github.com/m1k1o/neko/releases/tag/v3.1.2"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-4960","license":"OSV · upstream source license applies","key":"osv:GO-2026-4960","identifiers":["GO-2026-4960","CVE-2026-39386","GHSA-2gw9-c2r2-f5qf"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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