---
id: CVE-2026-77270
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 Jira and Confluence attachment
  upload tools treat caller-controlled file_path values as trusted server-local
  paths.…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-22
vendor: mcp-atlassian
product: mcp_atlassian
affected:
  - mcp_atlassian < 0.22.0
patched:
  - mcp_atlassian 0.22.0
published: '2026-09-22'
updated: '2026-09-28'
sourceUpdated: '2026-09-28T13:35:22.193'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77270'
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-f26r-j276-ggg4
    label: security-advisories@github.com
  - url: >-
      https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-f26r-j276-ggg4
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77270'
  - url: 'https://github.com/advisories/GHSA-f26r-j276-ggg4'
  - url: 'https://github.com/sooperset/mcp-atlassian'
  - url: 'https://pypi.org/project/mcp-atlassian'
tags:
  - nvd
  - cve.org
  - exploit-available
  - ghsa
  - pip
  - osv
epss: 0.005
epssPercentile: 0.42604
aliases:
  - GHSA-f26r-j276-ggg4
  - PYSEC-2026-4090
ecosystem: pip
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-22T18:36:12.641035Z'
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 Jira and Confluence attachment upload tools treat caller-controlled file_path values as trusted server-local paths. The server opens the selected file and uploads it to an Atlassian issue or page, allowing an MCP caller with upload access to disclose any file readable by the server process. The advisory traces the vulnerable input and processing flow through confluence_upload_attachment, jira_upload_attachment, file_path, and open(file_path, "rb"), 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-2026-77270)

Affected packages:

- `mcp-atlassian < 0.22.0`

Patched in:

- `mcp-atlassian 0.22.0`

Source: https://github.com/advisories/GHSA-f26r-j276-ggg4