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Medium severity6.5NVD Advisory· Published Sep 22, 2026· Updated Sep 29, 2026

CVE-2026-77257

CVE-2026-77257

Description

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, HTTP-exposed Jira and Confluence upload tools pass a caller-provided file_path to local file operations without restricting it to the workspace. A remote MCP caller with tool access can cause the server to read sensitive local files and upload them as Atlassian attachments. The advisory traces the vulnerable input and processing flow through streamable-http, upload_attachment, and file_path, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
mcp-atlassianPyPI
< 0.22.00.22.0

Affected products

3
  • Sooperset/Mcp Atlassian2 versions
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:a:mcp-atlassian:mcp_atlassian:*:*:*:*:*:*:*:*range: <0.22.0
    • (no CPE)range: <0.22.0
  • Atlassian/mcp-atlassianllm-fuzzy
    Range: <0.22.0

Patches

Vulnerability mechanics

References

5

News mentions

1