CVE-2026-77258
HIGHCVSS 7.7Description
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, upload_attachment in src/mcp_atlassian/confluence/attachments.py accepts a caller-controlled file_path and opens the selected server-local file without restricting it to the workspace. A permitted Confluence MCP caller can upload the file as an attachment and disclose data readable by the server process. This issue is fixed in version 0.22.0.
Timeline
Published:September 22nd, 2026 6:17 PM
Last modified:September 29th, 2026 2:01 PM
CVSS Scoring
CVSS v3: 7.7 (HIGH)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Affected Software
From NVD CPE configuration data
Vendors
mcp-atlassian
Products
mcp_atlassian
Weaknesses (CWE)
References & Reports
Advisories, patches, and third-party reports
- https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460Patch
- https://github.com/sooperset/mcp-atlassian/pull/1448Issue Tracking
- https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0Release Notes
- https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-93xw-j965-9mx3Exploit
- https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-93xw-j965-9mx3Exploit
Source: NIST NVD · Data may lag official sources by up to one minute