---
title: "github.com/kcp-dev/kcp — CVE-2026-61682"
description: "An authentication bypass flaw affects the Go package github.com/kcp-dev/kcp. Affected versions: < 0.31.4. Fixed from version 0.31.4. CVSS score 9.9."
canonical: https://inyourgeek.com/en/failles-de-securite/2026-09-18-cve-2026-61682
type: faille-de-securite
author: "Sébastien Soulier"
publisher: "InYourGeek"
language: en
datePublished: 2026-09-18
dateModified: 2026-09-18
---
# github.com/kcp-dev/kcp — CVE-2026-61682

An authentication bypass flaw affects the Go package github.com/kcp-dev/kcp. Affected versions: < 0.31.4. Fixed from version 0.31.4. CVSS score 9.9.

## What to do

Update github.com/kcp-dev/kcp to 0.31.4 or later.

| Fact | Value |
| --- | --- |
| Package | github.com/kcp-dev/kcp |
| Ecosystem | Go modules |
| Class | Authentication bypass |
| Affected versions | < 0.31.4 |
| Fixed version | 0.31.4 |
| CVSS | 9.9 |
| CVE | CVE-2026-61682 |
| GHSA | GHSA-c8w2-fgvx-vhv4 |
| Published on | September 18, 2026 |
| Severity | Critical |

## Sources

- [GitHub Security Advisory — GHSA-c8w2-fgvx-vhv4](https://github.com/advisories/GHSA-c8w2-fgvx-vhv4) — GitHub Security Advisories
- [NVD — CVE-2026-61682](https://nvd.nist.gov/vuln/detail/CVE-2026-61682) — NVD

---

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