What is CVE-2026-116679?

CVE-2026-116679 is a medium-severity vulnerability in M1k1o Neko, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-10-27.

How severe is CVE-2026-116679?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Auth bypass in M1k1o Neko

CVE-2026-116679

Neko is a a self-hosted virtual browser that runs in Docker and uses WebRTC. From version 3.0.0 until 3.1.5, Neko deployments with legacy mode and session.implicit_hosting enabled incorrectly authorize legacy WebRTC data-channel input because LegacyIsHost() evaluates host status incorrectly. An authenticated room member who establishes a WebRTC connection can send mouse and keyboard events through the legacy control channel while controls are locked or the member is otherwise unauthorized by the modern control API. This issue is fixed in version 3.1.5.

Vulnerability class: Broken Access Control

Published 2026-10-27.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

M1k1o Neko — versions >= 3.0.0, < 3.1.5

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

Frequently asked questions

What is CVE-2026-116679?: CVE-2026-116679 is a medium-severity vulnerability in M1k1o Neko, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-10-27.
How severe is CVE-2026-116679?: Medium severity. CVSS v3 base score is 5.4 out of 10.