Neko: Authorization bypass in legacy WebRTC input handling

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-116679
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-27 18:17:35 UTC
Updated2026-10-28 17:18:02 UTC
DescriptionNeko 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.

Risk And Classification

Primary CVSS: v3.1 5.4 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

EPSS: 0.003110000 probability, percentile 0.239820000 (date 2026-10-29)

Problem Types: CWE-863 | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
3.1CNADECLARED5.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA M1k1o Neko affected >= 3.0.0, < 3.1.5 Not specified

References

ReferenceSourceLinkTags
github.com/m1k1o/neko/security/advisories/GHSA-5cp7-fp4j-wwcv [email protected] github.com
github.com/m1k1o/neko/pull/675 [email protected] github.com
github.com/m1k1o/neko/releases/tag/v3.1.5 [email protected] github.com
github.com/m1k1o/neko/commit/395ca1a6f62b7b0e270e654d366a2d57b8042efd [email protected] github.com
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