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NVD description
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the HTTP transport accepts requests without a verified user identity and downstream fetcher construction falls back to the operator's globally configured Jira or Confluence credentials. A network client that can reach the MCP endpoint can invoke Atlassian tools as the operator, including read and write operations available to that account. The advisory traces the vulnerable input and processing flow through UserTokenMiddleware, AtlassianOpaqueTokenVerifier, _get_fetcher, and streamable-http, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
NONE
🚨Critical - MCP Atlassian HTTP Transport Auth Bypass (CVE-2026-77244) mcp-atlassian’s HTTP transport prior to 0.22.0 accepts requests without a verified user identity; fetcher construction can fall back to the operator’s globally configured Jira/Confluence credentials. Any network client with endpoint access can invoke Confluence/Jira tools as the operator for read/write actions. 👉Affected: mcp-atlassian < 0.22.0 | Upgrade to 0.22.0