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OpenAdvisories
High · 8.8 CVE-2026-39386 EUVD-2026-24027GHSA-2gw9-c2r2-f5qfGO-2026-4960

Neko has Self-service Privilege Escalation for Authenticated Users

Published Apr 21, 2026 · Updated Apr 22, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
m1k1o neko >= 3.0.0, < 3.0.11, >= 3.1.0, < 3.1.2 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
openSUSE Leap 16.0 govulncheck-vulndb 0.0.20260723T184607-160000.1.1 openSUSE-SU-2026:21483-1

Affected packages

EcosystemPackageAffectedFixedRecord
Go github.com/m1k1o/neko/server >= 3.0.0, < 3.0.11 3.0.11 GHSA-2gw9-c2r2-f5qf
Go github.com/m1k1o/neko/server >= 0.0.0-20250322225643-212bf8a60756, < 0.0.0-20260406184107-c54bcf1ee211 0.0.0-20260406184107-c54bcf1ee211 GHSA-2gw9-c2r2-f5qf
Go github.com/m1k1o/neko/server >= 0.0.0-20250326225119-51bbad7650d3, < 0.0.0-20260406184107-c54bcf1ee211 0.0.0-20260406184107-c54bcf1ee211 GO-2026-4960

Advisories 1

References