{"id":"CVE-2026-73496","title":"MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira)","summary":"MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the confluence_upload_attachment and confluence_upload_attachments tools pass a client-controlled file_path through src…","severity":"high","cvss":7.7,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","cwe":["CWE-22","CWE-73"],"vendor":"sooperset","product":"mcp-atlassian","affected":["mcp-atlassian < 0.22.0"],"published":"2026-09-14","updated":"2026-09-16","sourceUpdated":"2026-09-16T17:18:07.133","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73496","references":[{"url":"https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460","label":"security-advisories@github.com"},{"url":"https://github.com/sooperset/mcp-atlassian/pull/1448","label":"security-advisories@github.com"},{"url":"https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0","label":"security-advisories@github.com"},{"url":"https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-wm45-qh3g-v83f","label":"security-advisories@github.com"},{"url":"https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-wm45-qh3g-v83f","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/sooperset/mcp-atlassian"}],"tags":["nvd","cve.org","exploit-available","osv","pip"],"epss":0.00327,"epssPercentile":0.25979,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-16T16:09:47.067461Z"},"ingestedAt":"2026-09-14T20:14:21.156Z","aliases":["GHSA-wm45-qh3g-v83f"],"ecosystem":"pip","patched":["mcp-atlassian 0.22.0"],"slug":"CVE-2026-73496","body":"## Overview\n\nMCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the confluence_upload_attachment and confluence_upload_attachments tools pass a client-controlled file_path through src/mcp_atlassian/confluence/attachments.py upload_attachment, and the jira_update_issue attachments parameter reaches src/mcp_atlassian/jira/attachments.py upload_attachment, without confining either path to an approved server workspace. In a remote HTTP, SSE, or multi-user deployment, absolute or traversing paths are resolved on the MCP server and uploaded to Atlassian, allowing a client with write-tool access to disclose server files, environment-held Atlassian credentials, or another tenant's data. A local single-user stdio deployment does not cross this trust boundary because the server runs in the caller's environment. This issue is fixed in version 0.22.0.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-73496)\n\nAffected packages:\n\n- `mcp-atlassian < 0.22.0`\n\nPatched in:\n\n- `mcp-atlassian 0.22.0`\n\nSource: https://osv.dev/vulnerability/GHSA-wm45-qh3g-v83f","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":42.4,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":205584,"id":"CVE-2026-73496","ts":1789578062340,"field":"exploit_available","old":"false","new":"true"}]}