CVE-2026-77261

HIGH Status: Received

CVSS Scores

CVSS v3.x Base Score
7.1
HIGH

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.

Published
September 22, 2026 6:17 PM
Last Modified
September 22, 2026 6:17 PM
Source
[email protected]

Weaknesses (CWE)

CWE-918

References

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