sooperset mcp-atlassian up to 0.21.99 File Upload upload_attachment file_path path traversal

Summaryinfo

A vulnerability identified as critical has been detected in sooperset mcp-atlassian up to 0.21.99. The impacted element is the function upload_attachment of the component File Upload. This manipulation of the argument file_path causes path traversal. This vulnerability appears as CVE-2026-77260. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in sooperset mcp-atlassian up to 0.21.99 and classified as critical. Affected by this vulnerability is the function upload_attachment of the component File Upload. The manipulation of the argument file_path with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-77260 since 08/20/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

Upgrading to version 0.22.0 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• sooperset

Name

• mcp-atlassian

Version

• 0.21.0
• 0.21.1
• 0.21.2
• 0.21.3
• 0.21.4
• 0.21.5
• 0.21.6
• 0.21.7
• 0.21.8
• 0.21.9
• 0.21.10
• 0.21.11
• 0.21.12
• 0.21.13
• 0.21.14
• 0.21.15
• 0.21.16
• 0.21.17
• 0.21.18
• 0.21.19
• 0.21.20
• 0.21.21
• 0.21.22
• 0.21.23
• 0.21.24
• 0.21.25
• 0.21.26
• 0.21.27
• 0.21.28
• 0.21.29
• 0.21.30
• 0.21.31
• 0.21.32
• 0.21.33
• 0.21.34
• 0.21.35
• 0.21.36
• 0.21.37
• 0.21.38
• 0.21.39
• 0.21.40
• 0.21.41
• 0.21.42
• 0.21.43
• 0.21.44
• 0.21.45
• 0.21.46
• 0.21.47
• 0.21.48
• 0.21.49
• 0.21.50
• 0.21.51
• 0.21.52
• 0.21.53
• 0.21.54
• 0.21.55
• 0.21.56
• 0.21.57
• 0.21.58
• 0.21.59
• 0.21.60
• 0.21.61
• 0.21.62
• 0.21.63
• 0.21.64
• 0.21.65
• 0.21.66
• 0.21.67
• 0.21.68
• 0.21.69
• 0.21.70
• 0.21.71
• 0.21.72
• 0.21.73
• 0.21.74
• 0.21.75
• 0.21.76
• 0.21.77
• 0.21.78
• 0.21.79
• 0.21.80
• 0.21.81
• 0.21.82
• 0.21.83
• 0.21.84
• 0.21.85
• 0.21.86
• 0.21.87
• 0.21.88
• 0.21.89
• 0.21.90
• 0.21.91
• 0.21.92
• 0.21.93
• 0.21.94
• 0.21.95
• 0.21.96
• 0.21.97
• 0.21.98
• 0.21.99

Website

• Product: https://github.com/sooperset/mcp-atlassian/

CPE 2.3info

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CPE 2.2info

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Entryinfo

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