{"id":"CVE-2026-77243","published":"2026-09-22T18:17:17.410","lastModified":"2026-09-23T18:28:25.093","description":"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.","cvssScore":8.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwes":["CWE-862"],"vendors":[],"products":[],"references":[{"url":"https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460","tags":[]},{"url":"https://github.com/sooperset/mcp-atlassian/pull/1448","tags":[]},{"url":"https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0","tags":[]},{"url":"https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-3r68-hf9h-887v","tags":[]},{"url":"https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-3r68-hf9h-887v","tags":[]}],"exploitRefs":[{"url":"https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460","tags":[]},{"url":"https://github.com/sooperset/mcp-atlassian/pull/1448","tags":[]},{"url":"https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0","tags":[]},{"url":"https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-3r68-hf9h-887v","tags":[]},{"url":"https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-3r68-hf9h-887v","tags":[]}],"hasPoc":true,"ai":{"summary":"The flaw allows a client to invoke hidden tools despite configured least-privilege restrictions, leading to potential unauthorized access to read, write, or delete operations.","exploitability":"Exploitation is moderately hard as it requires knowledge of hidden tool names, but once obtained, the attack can bypass security controls.","blast_radius":"If exploited, this could lead to significant data breaches or system compromise, affecting Confluence and Jira users.","remediation":"Upgrade to MCP Atlassian 0.22.0 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["auth-bypass","web","atlassian"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-28T08:55:16.778Z"}}