CVE WatchSep 29, 2026

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-U

CVSS

6.5

Medium

EPSS

0.3%

p21

KEV

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Exploit Today

0-100

Published: Sep 22, 2026 · Last modified: Sep 29, 2026 · CWE-918

EPSS · 30d

0.3%EPSS · 30 days0.6%

2026-09-232026-10-20

Technical description

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 _process_authentication_headers and used to construct Atlassian fetchers without calling validate_url_for_ssrf. A caller who can set these headers can supply an internal or metadata-service URL and cause the server to send requests to that destination, bypassing the incomplete CVE-2026-27826 remediation. This issue is fixed in version 0.22.0.

Official references

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