CVE-2026-77274
MCP Atlassian: SSRF Protection Bypass
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, validate_url_for_ssrf has a backslash authority confusion because it interprets the authority differently from the Requests connection layer in the header-based Jira and Confluence URL authentication flow. A crafted URL can validate as an external hostname while the HTTP client connects to an internal host, permitting server-side requests to protected network resources. This issue is fixed in version 0.22.0.
| CWE | CWE-918 |
| Vendor | sooperset |
| Product | mcp-atlassian |
| Published | Sep 22, 2026 |
| Last Updated | Sep 22, 2026 |
Stay Ahead of the Next One
Get instant alerts for sooperset mcp-atlassian
Be the first to know when new unknown vulnerabilities affecting sooperset mcp-atlassian are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
Affected Versions
sooperset / mcp-atlassian
< 0.22.0
References
github.com: https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-hgcf-4mq8-5266 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