MCP Atlassian: SSRF Protection Bypass

Environment - Project: sooperset/mcp-atlassian - Affected function: validateurlforssrf - Affected path: header-based Jira/Confluence URL authentication flow - Tested endpoint: POST /mcp - Tested version: 2.14.5 Description The SSRF protection in validateurlforssrf can be bypassed with a URL...

mcp-atlassian has an incomplete SSRF remediation

Summary The UserTokenMiddleware extracts URLs from X-Atlassian-Jira-Url and X-Atlassian-Confluence-Url HTTP headers and passes them directly to API client constructors without any SSRF validation. Affected Package - Ecosystem: PyPI - Package: mcp-atlassian - Affected versions: all versions before...

MCP Atlassian: SSRF via DNS Rebinding in Header-Based Authentication Flow

Summary The SSRF protection for header-based authentication uses a validate-then-use pattern vulnerable to DNS rebinding. validateurlforssrf resolves the hostname via DNS and checks that the resolved IP is globally routable. However, the actual HTTP request happens later, during which the DNS...

CVE-2026-77265

MCP Atlassian is a Model Context Protocol MCP server for Atlassian products Confluence and Jira. Prior to 0.22.0, header-supplied Jira or Confluence URLs are resolved and validated before the HTTP client resolves the hostname again for the connection. An unauthenticated caller can use a...

CVE-2026-77267

MCP Atlassian is a Model Context Protocol MCP server for Atlassian products Confluence and Jira. Prior to 0.22.0, the X-Atlassian-Jira-Url and X-Atlassian-Confluence-Url headers are processed by processauthenticationheaders and used to construct Atlassian fetchers without calling...

CVE-2026-77267 mcp-atlassian has an incomplete SSRF remediation

MCP Atlassian is a Model Context Protocol MCP server for Atlassian products Confluence and Jira. Prior to 0.22.0, the X-Atlassian-Jira-Url and X-Atlassian-Confluence-Url headers are processed by processauthenticationheaders and used to construct Atlassian fetchers without calling...

CVE-2026-77267 mcp-atlassian has an incomplete SSRF remediation

MCP Atlassian is a Model Context Protocol MCP server for Atlassian products Confluence and Jira. Prior to 0.22.0, the X-Atlassian-Jira-Url and X-Atlassian-Confluence-Url headers are processed by processauthenticationheaders and used to construct Atlassian fetchers without calling...

EUVD-2026-84621

MCP Atlassian is a Model Context Protocol MCP server for Atlassian products Confluence and Jira. Prior to 0.22.0, the X-Atlassian-Jira-Url and X-Atlassian-Confluence-Url headers are processed by processauthenticationheaders and used to construct Atlassian fetchers without calling...

CVE-2026-77267

The MCP Atlassian server (a Model Context Protocol server for Confluence and Jira) is vulnerable to Server-Side Request Forgery (SSRF) in versions prior to 0.22.0 . The root cause is that the _process_authentication_headers function processes X-Atlassian-Jira-Url and X-Atlassian-Confluence-Url he...

CVE-2026-77265 MCP Atlassian: SSRF via DNS Rebinding in Header-Based Authentication Flow

MCP Atlassian is a Model Context Protocol MCP server for Atlassian products Confluence and Jira. Prior to 0.22.0, header-supplied Jira or Confluence URLs are resolved and validated before the HTTP client resolves the hostname again for the connection. An unauthenticated caller can use a...

CVE-2026-77265

The mcp-atlassian Model Context Protocol server is vulnerable to Server-Side Request Forgery (SSRF) via DNS rebinding in versions prior to 0.22.0 . The flaw exists in the header-based authentication flow where the software uses a validate-then-use pattern. Specifically, the validate_url_for_ssrf ...

EUVD-2026-84606

MCP Atlassian is a Model Context Protocol MCP server for Atlassian products Confluence and Jira. Prior to 0.22.0, header-supplied Jira or Confluence URLs are resolved and validated before the HTTP client resolves the hostname again for the connection. An unauthenticated caller can use a...

CVE-2026-77265 MCP Atlassian: SSRF via DNS Rebinding in Header-Based Authentication Flow

MCP Atlassian is a Model Context Protocol MCP server for Atlassian products Confluence and Jira. Prior to 0.22.0, header-supplied Jira or Confluence URLs are resolved and validated before the HTTP client resolves the hostname again for the connection. An unauthenticated caller can use a...

CVE-2026-77267: Server-Side Request Forgery (SSRF)

MCP Atlassian is a Model Context Protocol MCP server for Atlassian products Confluence and Jira. Prior to 0.22.0, the X-Atlassian-Jira-Url and X-Atlassian-Confluence-Url headers are processed by processauthenticationheaders and used to construct Atlassian fetchers without calling...

CVE-2026-77265: Server-Side Request Forgery (SSRF)

MCP Atlassian is a Model Context Protocol MCP server for Atlassian products Confluence and Jira. Prior to 0.22.0, header-supplied Jira or Confluence URLs are resolved and validated before the HTTP client resolves the hostname again for the connection. An unauthenticated caller can use a...

CVE-2026-73497: Server-Side Request Forgery (SSRF)

MCP Atlassian is a Model Context Protocol MCP server for Atlassian products Confluence and Jira. From 0.17.0 until 0.22.0, validateurlforssrf resolves the attacker-controlled X-Atlassian-Jira-Url and X-Atlassian-Confluence-Url header host once at middleware time, but the outbound request is built...

PYSEC-2026-2621 MCP Atlassian has SSRF via unvalidated X-Atlassian-Jira-Url / X-Atlassian-Confluence-Url headers

Summary 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...

MCP Atlassian has SSRF via unvalidated X-Atlassian-Jira-Url / X-Atlassian-Confluence-Url headers

SummaryAn 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 vulnerabili...

EUVD-2026-10788

MCP Atlassian has SSRF via unvalidated X-Atlassian-Jira-Url / X-Atlassian-Confluence-Url headers...

GHSA-7R34-79R5-RCC9 MCP Atlassian has SSRF via unvalidated X-Atlassian-Jira-Url / X-Atlassian-Confluence-Url headers

Summary 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...