Path Manipulation Vulnerability in MCP Server for Atlassian Products
CVE-2026-77247

8.3HIGH

Key Information:

Vendor

Sooperset

Status
Mcp-atlassian
Vendor
CVE Published:
22 September 2026

What is CVE-2026-77247?

The MCP server for Atlassian products, specifically Confluence and Jira, is vulnerable to path manipulation issues prior to version 0.22.0. This vulnerability allows a permitted client to exploit the upload tools to disclose sensitive host files by manipulating caller-controlled path arguments. The vulnerability is traced through various entry points in the code, such as AttachmentsMixin.upload_attachment and related functions, facilitating unauthorized access to local files without requiring direct filesystem access. This significant risk is addressed in version 0.22.0.

Affected Version(s)

mcp-atlassian < 0.22.0

References

https://github.com/sooperset/mcp-atlassian/security/advis...
x_refsource_CONFIRM
https://github.com/sooperset/mcp-atlassian/pull/1448
x_refsource_MISC
https://github.com/sooperset/mcp-atlassian/commit/b041733...
x_refsource_MISC

CVSS V4

Score:
8.3
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.