CVE-2026-73498 mcp-atlassian: Arbitrary file read via missing path validation in confluence_upload_attachment
An authenticated MCP client can read arbitrary server files and exfiltrate them as Confluence attachments due to missing path validation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-73498?
CVE-2026-73498 is a high-severity path traversal vulnerability in sooperset mcp-atlassian, published on 12 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, confluence_upload_attachment passes its client-supplied file_path directly to open(file_path, "rb") in src/mcp_atlassian/confluence/attachments.py through _upload_attachment_direct() without calling validate_safe_path. An authenticated MCP client can read any file accessible to the server process and exfiltrate it to Confluence as an attachment. If an AI agent can be induced to call the tool through untrusted content, the same flaw can disclose server environment variables such as CONFLUENCE_API_TOKEN and other credentials. This issue is fixed in version 0.22.0.
Weakness: CWE-22
Which versions are affected by CVE-2026-73498?
3 open source packages ship an affected version, including mcp-atlassian.
| Package | Affected | Fixed in |
|---|---|---|
mcp-atlassian PyPI | All versions | 0.22.0 |
mcp-atlassian PyPI | All versions | 0.22.0 |
mcp-atlassian PyPI | All versions | 0.22.0 |
How do I fix CVE-2026-73498?
Upgrade mcp-atlassian to 0.22.0 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-73498 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-73498 exists.
Sources
Also known as GHSA-g5r6-gv6m-f5jv, PYSEC-2026-3683.