CVE-2026-77243

MCP Atlassian: ENABLED_TOOLS / Toolset authorization bypass

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, ENABLED_TOOLS and TOOLSETS are applied when tools are listed but are not rechecked when a tools/call request is dispatched. A client that knows a hidden tool name can directly invoke excluded read, write, or delete tools despite the operator's configured least-privilege restrictions. The advisory traces the vulnerable input and processing flow through ENABLED_TOOLS, TOOLSETS, tools/list, tools/call, and _call_tool_mcp, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.

Affected

sooperset · mcp-atlassian

CVSS v3.1 GITHUB

8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.32% chance of exploitation in the next 30 days, 24th percentile

Published

2026-09-22

Proof-of-concept exploits (1)

• advisories/GHSA-3r68-hf9h-887v

Security advisories

• sooperset/mcp-atlassian/security/advisories/GHSA-3r68-hf9h-887v
• sooperset/mcp-atlassian/pull/1448

References

• CVE Record
• NVD entry