Vulnerability · Published Oct 27, 2026 · Assigned by GitHub_M

CVE-2026-116679Neko: Authorization bypass in legacy WebRTC input handling

Medium 5.4

In plain English

A medium-severity incorrect authorization in neko from m1k1o. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.3%top 75.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/m1k1o/neko/server	0.0.0-20260805142851-395ca1a6f62b	GHSA-5cp7-fp4j-wwcv
Go	github.com/m1k1o/neko/server	0.0.0-20260805142851-395ca1a6f62b	GO-2026-6869

Affected products (as reported)

Vendor	Product	Versions
m1k1o	neko	>= 3.0.0, < 3.1.5

Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

References

https://github.com/m1k1o/neko/security/advisories/GHSA-5cp7-fp4j-wwcv x_refsource_CONFIRM
https://github.com/m1k1o/neko/pull/675 x_refsource_MISC
https://github.com/m1k1o/neko/commit/395ca1a6f62b7b0e270e654d366a2d57b8042efd x_refsource_MISC
https://github.com/m1k1o/neko/releases/tag/v3.1.5 x_refsource_MISC