CVE-2026-77260: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in sooperset mcp-atlassian
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the Confluence and Jira upload_attachment implementations accept an unconstrained file_path and open the referenced server-local file. A permitted MCP caller can upload sensitive host files to an Atlassian destination and then retrieve their contents. The advisory traces the vulnerable input and processing flow through upload_attachment, file_path, and CVE-2026-27825, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.
AI Analysis
Technical Summary
MCP Atlassian is a Model Context Protocol server used with Atlassian products Confluence and Jira. Versions before 0.22.0 have a path traversal vulnerability (CWE-22) in the upload_attachment functionality, where the file_path parameter is not properly constrained. This allows an authorized MCP caller to upload arbitrary files from the host system to an Atlassian destination and subsequently retrieve their contents. The vulnerability is addressed and fixed in version 0.22.0.
Potential Impact
An attacker with MCP caller permissions can exploit this vulnerability to upload and access sensitive files from the host system, potentially leading to unauthorized disclosure of sensitive information. The CVSS 4.0 score of 8.3 (high severity) reflects the network attack vector, low attack complexity, no privileges required beyond MCP caller, and high confidentiality impact.
Mitigation Recommendations
Upgrade to version 0.22.0 or later, where this vulnerability has been fixed. No other mitigation steps are indicated by the vendor advisory.
CVE-2026-77260: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in sooperset mcp-atlassian
Description
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the Confluence and Jira upload_attachment implementations accept an unconstrained file_path and open the referenced server-local file. A permitted MCP caller can upload sensitive host files to an Atlassian destination and then retrieve their contents. The advisory traces the vulnerable input and processing flow through upload_attachment, file_path, and CVE-2026-27825, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.
CVSS v4.0
Score 8.3high
Affected software
sooperset
mcp-atlassian
pkg:github/sooperset/mcp-atlassianRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
MCP Atlassian is a Model Context Protocol server used with Atlassian products Confluence and Jira. Versions before 0.22.0 have a path traversal vulnerability (CWE-22) in the upload_attachment functionality, where the file_path parameter is not properly constrained. This allows an authorized MCP caller to upload arbitrary files from the host system to an Atlassian destination and subsequently retrieve their contents. The vulnerability is addressed and fixed in version 0.22.0.
Potential Impact
An attacker with MCP caller permissions can exploit this vulnerability to upload and access sensitive files from the host system, potentially leading to unauthorized disclosure of sensitive information. The CVSS 4.0 score of 8.3 (high severity) reflects the network attack vector, low attack complexity, no privileges required beyond MCP caller, and high confidentiality impact.
Mitigation Recommendations
Upgrade to version 0.22.0 or later, where this vulnerability has been fixed. No other mitigation steps are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-20T19:02:23.417Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ab2c670f7a7c541068f922d
Added to database: 09/22/2026, 18:18:24 UTC
Last enriched: 09/22/2026, 18:32:45 UTC
Last updated: 09/23/2026, 01:58:06 UTC
Views: 12
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