{"cve":"CVE-2026-39386","nvd":{"published":"2026-04-21T01:16:06.217","modified":"2026-10-26T22:10:00.163","status":"Analyzed","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. Upgrading is strongly recommended.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8},"cwes":["CWE-20","CWE-269","CWE-284","CWE-639","CWE-862"],"references":["https://github.com/m1k1o/neko/releases/tag/v3.0.11","https://github.com/m1k1o/neko/releases/tag/v3.1.2","https://github.com/m1k1o/neko/security/advisories/GHSA-2gw9-c2r2-f5qf"],"products":["m1k1o:neko"],"source":"nvd","synced_at":"2026-10-26T22:26:44.656832877+00:00"},"epss":{"cve":"CVE-2026-39386","score":0.00437,"percentile":0.3772,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-2gw9-c2r2-f5qf","url":"https://osv.dev/vulnerability/GHSA-2gw9-c2r2-f5qf","summary":"Neko has a Self-service Privilege Escalation for Authenticated Users","modified":"2026-06-09T10:52:18Z","packages":[{"ecosystem":"Go","name":"github.com/m1k1o/neko/server","purl":"pkg:golang/github.com/m1k1o/neko/server","ranges":[">=3.0.0 <3.0.11"],"fixed":["3.0.11"]},{"ecosystem":"Go","name":"github.com/m1k1o/neko/server","purl":"pkg:golang/github.com/m1k1o/neko/server","ranges":[">=0.0.0-20250322225643-212bf8a60756 <0.0.0-20260406184107-c54bcf1ee211"],"fixed":["0.0.0-20260406184107-c54bcf1ee211"]}]},{"id":"GO-2026-4960","url":"https://osv.dev/vulnerability/GO-2026-4960","summary":"Neko has a Self-service Privilege Escalation for Authenticated Users in github.com/m1k1o/neko/server","modified":"2026-06-01T22:00:20.498066990Z","packages":[{"ecosystem":"Go","name":"github.com/m1k1o/neko/server","purl":"pkg:golang/github.com/m1k1o/neko/server","ranges":[">=0.0.0-20250326225119-51bbad7650d3 <0.0.0-20260406184107-c54bcf1ee211"],"fixed":["0.0.0-20260406184107-c54bcf1ee211"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}