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OpenAdvisories
High · 7.1 CVE-2026-77261 EUVD-2026-84631GHSA-6529-c226-h328PYSEC-2026-4085

MCP Atlassian: SSRF redirect protection missing for basic-auth and OAuth authentication branches

Published Sep 22, 2026 · Updated Sep 23, 2026 · Assigned by GitHub_M

Description

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, _make_ssrf_safe_hook is omitted from JiraFetcher and ConfluenceFetcher sessions created through the basic-auth and oauth_pat branches. If an attacker-controlled or compromised configured Atlassian instance returns a redirect to an internal address, those sessions can follow the redirect without revalidating its destination. This issue is fixed in version 0.22.0.

Affected products

VendorProductAffectedFixed
sooperset mcp-atlassian < 0.22.0 —

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI mcp-atlassian < 0.22.0 0.22.0 GHSA-6529-c226-h328

References