CVE-2026-77261
MCP Atlassian: SSRF redirect protection missing for basic-auth and OAuth authentication branches
CVSS Score
7.1
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, _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.
| CWE | CWE-918 |
| Vendor | sooperset |
| Product | mcp-atlassian |
| Published | Sep 22, 2026 |
Stay Ahead of the Next One
Get instant alerts for sooperset mcp-atlassian
Be the first to know when new high vulnerabilities affecting sooperset mcp-atlassian are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
Low
Availability
None
Affected Versions
sooperset / mcp-atlassian
< 0.22.0
References
github.com: https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-6529-c226-h328 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