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.
References
| Link | Resource |
|---|---|
| https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460 | Patch |
| https://github.com/sooperset/mcp-atlassian/pull/1448 | Issue Tracking Patch |
| https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0 | Release Notes |
| https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-f26r-j276-ggg4 | Exploit Mitigation Vendor Advisory |
| https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-f26r-j276-ggg4 | Exploit Mitigation Vendor Advisory |
Configurations
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 - Patch | |
| References | () https://github.com/sooperset/mcp-atlassian/pull/1448 - Issue Tracking, Patch | |
| References | () 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 - 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 - |
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')
