CVE-2026-77274: CWE-918: Server-Side Request Forgery (SSRF) in sooperset mcp-atlassian
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, validate_url_for_ssrf has a backslash authority confusion because it interprets the authority differently from the Requests connection layer in the header-based Jira and Confluence URL authentication flow. A crafted URL can validate as an external hostname while the HTTP client connects to an internal host, permitting server-side requests to protected network resources. This issue is fixed in version 0.22.0.
CVE-2026-77274: CWE-918: Server-Side Request Forgery (SSRF) in sooperset mcp-atlassian
Description
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, validate_url_for_ssrf has a backslash authority confusion because it interprets the authority differently from the Requests connection layer in the header-based Jira and Confluence URL authentication flow. A crafted URL can validate as an external hostname while the HTTP client connects to an internal host, permitting server-side requests to protected network resources. This issue is fixed in version 0.22.0.
CVSS v4.0
Score 8.8high
Affected software
sooperset
mcp-atlassian
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-20T19:14:21.330Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ab2bf68f7a7c54106872671
Added to database: 09/22/2026, 17:48:24 UTC
Last updated: 09/22/2026, 17:48:24 UTC
Views: 1
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