CVE-2026-73496
highMCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira).
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/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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460 security-advisories@github.com
- https://github.com/sooperset/mcp-atlassian/pull/1448 security-advisories@github.com
- https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0 security-advisories@github.com
- https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-wm45-qh3g-v83f security-advisories@github.com
- https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-wm45-qh3g-v83f 134c704f-9b21-4f2e-91b3-4a467353bcc0