MCP Atlassian: Arbitrary local file READ via unconstrained file_path in upload_attachment (Confluence + Jira)

Date Sep 22, 2026

Type Vendor advisory

Signal High-risk advisory

Vendor / Product PyPI · mcp-atlassian

CVE CVE-2026-77260

High-risk advisory CVE-2026-77260

Summary

MCP Atlassian: Arbitrary local file READ via unconstrained file_path in upload_attachment (Confluence + Jira)

Why it matters

GitHub has published a reviewed security advisory for mcp-atlassian. Prioritize it with other application dependency updates.

Operator check

Check whether mcp-atlassian is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. CVSS score: 8.3.

Sources

GitHub Advisory GHSA-f4p7-qx46-wc5j NVD — CVE-2026-77260 Source reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

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