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Advisory record · GHSA-2gw9-c2r2-f5qf

Neko has a Self-service Privilege Escalation for Authenticated Users

CVSS 8.8 HighEPSS 0.0044 · 38th percentile

Published by the GitHub Advisory Database at 21 Apr 2026, 17:24 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/m1k1o/neko/serverGo>=3.0.0, <3.0.11 || >=0.0.0-20250322225643-212bf8a60756, <0.0.0-20260406184107-c54bcf1ee2113.0.11, 0.0.0-20260406184107-c54bcf1ee211
Identifiers
GHSA-2gw9-c2r2-f5qf · CVE-2026-39386 · GO-2026-4960
Weakness (CWE)
CWE-20 · CWE-269 · CWE-284 · CWE-639 · CWE-862
Tags
Published
21 Apr 2026
Updated
9 Jun 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Neko (Go package github.com/m1k1o/neko/server) versions from 0.0.0-20250322225643-212bf8a60756 up to but not including 0.0.0-20260406184107-c54bcf1ee211, and 3.0.0 up to but not including 3.0.11, are vulnerable to privilege escalation. Any authenticated user can gain full administrative control of the instance, including member management, room settings, and session termination. Upgrade to 0.0.0-20260406184107-c54bcf1ee211, 3.0.11, or later in the 3.0 line; the source also lists v3.1.2 as a fixed release.

Written 7 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.8 High 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0044, the 38th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:08 UTC First seen by agentprime
  2. 31 Oct 2026, 15:08 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.