{"id":"CVE-2026-77262","published":"2026-09-22T19:16:50.480","lastModified":"2026-09-28T18:17:24.623","description":"MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, confluence_upload_attachment accepts an attacker-controlled file_path and does not apply the path restriction added for the earlier download vulnerability. A caller can traverse outside the workspace and upload arbitrary server-readable files to Confluence. The advisory traces the vulnerable input and processing flow through confluence_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.","cvssScore":8.6,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","cwes":["CWE-22"],"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-p6hp-93wp-fh6p","tags":[]},{"url":"https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-p6hp-93wp-fh6p","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-p6hp-93wp-fh6p","tags":[]},{"url":"https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-p6hp-93wp-fh6p","tags":[]}],"hasPoc":true,"ai":{"summary":"This flaw allows an attacker to upload arbitrary files outside the workspace by manipulating the file_path parameter in confluence_upload_attachment, potentially leading to unauthorized access to server-readable files.","exploitability":"Exploitation is moderately hard as it requires control over the file_path parameter, but preconditions such as access to the Confluence server are necessary.","blast_radius":"If exploited, the impact is limited to the Confluence server, where unauthorized files could be uploaded and accessed, potentially leading to data exposure or further attacks.","remediation":"Upgrade to MCP Atlassian version 0.22.0 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["upload","file","web"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-30T09:26:44.588Z"}}