CVE-2026-77267
mcp-atlassian has an incomplete SSRF remediation
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-918 |
| Vendor | sooperset |
| Product | mcp-atlassian |
| Published | Sep 22, 2026 |
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Affected Versions
sooperset / mcp-atlassian
< 0.22.0
References
github.com: https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-5wf4-jqxh-8gm3 github.com: https://github.com/sooperset/mcp-atlassian/pull/1448 github.com: https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460 github.com: https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0