---
id: CVE-2026-77244
title: >-
  MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products
  (Confluence and Jira)
summary: >-
  MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products
  (Confluence and Jira). Prior to 0.22.0, the HTTP transport accepts requests
  without a verified user identity and downstream fetcher construction falls
  back to …
severity: critical
cvss: 10
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N'
cwe:
  - CWE-287
  - CWE-303
  - CWE-862
vendor: mcp-atlassian
product: mcp_atlassian
affected:
  - mcp_atlassian < 0.22.0
patched:
  - mcp_atlassian 0.22.0
published: '2026-09-22'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T15:17:49.490'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77244'
references:
  - url: >-
      https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460
    label: security-advisories@github.com
  - url: 'https://github.com/sooperset/mcp-atlassian/pull/1448'
    label: security-advisories@github.com
  - url: 'https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-wrhw-j3f9-8vc6
    label: security-advisories@github.com
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77244'
  - url: 'https://github.com/advisories/GHSA-wrhw-j3f9-8vc6'
  - url: 'https://github.com/sooperset/mcp-atlassian'
  - url: 'https://pypi.org/project/mcp-atlassian'
tags:
  - nvd
  - cve.org
  - ghsa
  - pip
  - osv
epss: 0.00346
epssPercentile: 0.28019
aliases:
  - GHSA-wrhw-j3f9-8vc6
  - PYSEC-2026-4103
ecosystem: pip
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-22T18:55:17.366068Z'
ingestedAt: '2026-09-22T18:08:12.486Z'
---

## Overview

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the HTTP transport accepts requests without a verified user identity and downstream fetcher construction falls back to the operator's globally configured Jira or Confluence credentials. A network client that can reach the MCP endpoint can invoke Atlassian tools as the operator, including read and write operations available to that account. The advisory traces the vulnerable input and processing flow through UserTokenMiddleware, AtlassianOpaqueTokenVerifier, _get_fetcher, and streamable-http, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.

## Affected

- `mcp_atlassian < 0.22.0`

## Remediation

Upgrade past the affected range:

- `mcp_atlassian 0.22.0`

## Package advisory (CVE-2026-77244)

Affected packages:

- `mcp-atlassian < 0.22.0`

Patched in:

- `mcp-atlassian 0.22.0`

Source: https://github.com/advisories/GHSA-wrhw-j3f9-8vc6