CVE-2026-77270

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.
Configurations

Configuration 1 (hide)

cpe:2.3:a:mcp-atlassian:mcp_atlassian:*:*:*:*:*:*:*:*

History

28 Sep 2026, 13:35

Type Values Removed Values Added
First Time Mcp-atlassian
Mcp-atlassian mcp Atlassian
References () https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460 - () https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460 - Patch
References () https://github.com/sooperset/mcp-atlassian/pull/1448 - () https://github.com/sooperset/mcp-atlassian/pull/1448 - Issue Tracking, Patch
References () https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0 - () https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0 - Release Notes
References () https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-f26r-j276-ggg4 - () https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-f26r-j276-ggg4 - Exploit, Mitigation, Vendor Advisory
CPE cpe:2.3:a:mcp-atlassian:mcp_atlassian:*:*:*:*:*:*:*:*

22 Sep 2026, 19:16

Type Values Removed Values Added
References () https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-f26r-j276-ggg4 - () https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-f26r-j276-ggg4 -

22 Sep 2026, 18:17

Type Values Removed Values Added
New CVE

Information

Published : 2026-09-22 18:17

Updated : 2026-09-28 13:35


NVD link : CVE-2026-77270

Mitre link : CVE-2026-77270

CVE.ORG link : CVE-2026-77270


JSON object : View

Products Affected

mcp-atlassian

  • mcp_atlassian
CWE
CWE-22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')