CVE-2026-77249

Description

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, JiraUserMixin._lookup_user_by_permissions uses the module-level requests.get function instead of the fetcher's protected session. A caller-controlled public Jira URL can redirect that unhooked request to an internal address, bypassing the redirect checks added for CVE-2026-27826. The advisory traces the vulnerable input and processing flow through JiraUserMixin._lookup_user_by_permissions, requests.get, self.jira._session.get, and _make_ssrf_safe_hook, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.

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Produits concernés

• sooperset mcp-atlassian
• Mcp-atlassian mcp atlassian

Scores CVSS

Faiblesses (CWE)

• CWE-918

Références

• https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460 Patch
• https://github.com/sooperset/mcp-atlassian/pull/1448 Issue TrackingPatch
• https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0 Release Notes
• https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-v9m3-wfh8-5646 ExploitVendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories