GHSA-5cp7-fp4j-wwcv

Source

https://github.com/advisories/GHSA-5cp7-fp4j-wwcv

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-5cp7-fp4j-wwcv/GHSA-5cp7-fp4j-wwcv.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-5cp7-fp4j-wwcv

Aliases

CVE-2026-116679

Published

2026-10-27T21:04:57Z

Modified

2026-10-27T21:15:03Z

Severity

5.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L CVSS Calculator

Summary

Neko: Authorization bypass in legacy WebRTC input handling

Details

Impact

When legacy mode is enabled and session.implicit_hosting is enabled, the legacy WebRTC data channel incorrectly authorizes input events due to a logic error in LegacyIsHost().

As a result, an authenticated room member may be able to send mouse and keyboard input through the legacy WebRTC control channel even when controls are locked or the member would otherwise not be authorized through the modern control API.

The issue affects only the legacy WebRTC input path. The modern HTTP/WebSocket control path correctly enforces authorization checks and is not affected.

To exploit this issue, an attacker must:

Be authenticated as a room member.
Successfully establish a WebRTC connection.
Access a deployment using the legacy WebRTC input handler.

No unauthenticated access or privilege escalation outside the application is possible.

Patches

The issue has been fixed in v3.1.5 by correcting the authorization logic in the legacy WebRTC handler.

Users should upgrade to v3.1.5 or later. Fix: 395ca1a

Workarounds

Users who cannot immediately upgrade can mitigate the issue by one of the following:

Disable legacy mode if it is not required.
Disable implicit hosting (session.implicit_hosting=false).
Restrict access to trusted authenticated users.

Credits

Thanks to @KasperBuilds for responsibly disclosing this vulnerability and reaching out directly. This contribution helped strengthen the project, and the whole community benefits from it.

Database specific

{
    "cwe_ids":  [
        "CWE-863"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-10-27T21:04:57Z",
    "nvd_published_at":  "2026-10-27T18:17:35Z",
    "severity":  "MODERATE"
}

References

Affected packages

Go / github.com/m1k1o/neko/server

Package

Name: github.com/m1k1o/neko/server; View open source insights on deps.dev
Purl: pkg:golang/github.com/m1k1o/neko/server

Affected ranges

Type: SEMVER
Events: Introduced

0.0.0-20250401220545-fe94c999c6af

Fixed

0.0.0-20260805142851-395ca1a6f62b

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-5cp7-fp4j-wwcv/GHSA-5cp7-fp4j-wwcv.json"