File Upload Vulnerability in Atlassian Confluence and Jira Products
CVE-2026-77262

8.6HIGH

Key Information:

Vendor

Sooperset

Status
Mcp-atlassian
Vendor
CVE Published:
22 September 2026

What is CVE-2026-77262?

The MCP Atlassian server for Confluence and Jira contains a vulnerability in the confluence_upload_attachment function that allows arbitrary file uploads via an attacker-controlled file_path. This issue could potentially lead to unauthorized access to sensitive files on the server by allowing a malicious actor to traverse directories outside the intended workspace. The vulnerability has been addressed in version 0.22.0, where appropriate path restrictions were implemented to prevent such exploitation.

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 V3.1

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.