What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-27 · updated 2026-10-28
• Weakness: CWE-863

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 products

• m1k1o neko: from 3.0.0, < 3.1.5

References

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

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