---
title: "mcp-atlassian — CVE-2026-77243"
description: "An authentication bypass flaw affects the PyPI package mcp-atlassian. Affected versions: < 0.22.0. Fixed from version 0.22.0. CVSS score 8.8."
canonical: https://inyourgeek.com/en/failles-de-securite/2026-09-22-cve-2026-77243
type: faille-de-securite
author: "Sébastien Soulier"
publisher: "InYourGeek"
language: en
datePublished: 2026-09-22
dateModified: 2026-09-22
---
# mcp-atlassian — CVE-2026-77243

An authentication bypass flaw affects the PyPI package mcp-atlassian. Affected versions: < 0.22.0. Fixed from version 0.22.0. CVSS score 8.8.

## What to do

Update mcp-atlassian to 0.22.0 or later.

| Fact | Value |
| --- | --- |
| Package | mcp-atlassian |
| Ecosystem | PyPI (Python) |
| Class | Authentication bypass |
| Affected versions | < 0.22.0 |
| Fixed version | 0.22.0 |
| CVSS | 8.8 |
| CVE | CVE-2026-77243 |
| GHSA | GHSA-3r68-hf9h-887v |
| Published on | September 22, 2026 |
| Severity | High |

## Sources

- [GitHub Security Advisory — GHSA-3r68-hf9h-887v](https://github.com/advisories/GHSA-3r68-hf9h-887v) — GitHub Security Advisories
- [NVD — CVE-2026-77243](https://nvd.nist.gov/vuln/detail/CVE-2026-77243) — NVD

---

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