Description
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to version 0.17.0, an unauthenticated attacker who can reach the mcp-atlassian HTTP endpoint can force the server process to make outbound HTTP requests to an arbitrary attacker-controlled URL by supplying two custom HTTP headers without an `Authorization` header. No authentication is required. The vulnerability exists in the HTTP middleware and dependency injection layer — not in any MCP tool handler - making it invisible to tool-level code analysis. In cloud deployments, this could enable theft of IAM role credentials via the instance metadata endpoint (`169[.]254[.]169[.]254`). In any HTTP deployment it enables internal network reconnaissance and injection of attacker-controlled content into LLM tool results. Version 0.17.0 fixes the issue.
INFO
Published Date :
2026-03-10T18:46:12.069Z
Last Modified :
2026-03-10T19:15:10.505Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-27826 vulnerability.
| Vendors | Products |
|---|---|
| Sooperset |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-27826.
