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CVE-2026-77254

MCP Atlassian: Unauthenticated HTTP MCP requests can use globally configured Jira and Confluence credentials

CVSS 3.1 9.1 CRITICALCheck source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-77254

Published

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, requests to the HTTP MCP endpoint without a per-user identity are allowed to reach tool handlers, which then use globally configured Jira or Confluence credentials. A network caller can perform operations with the operator account's permissions unless the deployment has an independent authentication boundary. The advisory traces the vulnerable input and processing flow through streamable-http, UserTokenMiddleware, _get_fetcher, and global credentials, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.

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23 Oct 2026 15:48:27 UTC

MCP Atlassian: Unauthenticated HTTP MCP requests can use globally configured Jira and Confluence credentials

cve-program · CVE-2026-77254 · Published

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 13 Nov 10:02 UTC · 274 of 275 readable · 272 fully read · documentation 469/469 current

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