CVE-2026-77274
HIGHCVSS 8.2Description
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.
Timeline
Published:September 22nd, 2026 6:17 PM
Last modified:September 28th, 2026 1:41 PM
CVSS Scoring
CVSS v3: 8.2 (HIGH)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Affected Software
From NVD CPE configuration data
Vendors
mcp-atlassian
Products
mcp_atlassian
Weaknesses (CWE)
References & Reports
Advisories, patches, and third-party reports
- https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460Patch
- https://github.com/sooperset/mcp-atlassian/pull/1448Issue Tracking
- https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0Release Notes
- https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-hgcf-4mq8-5266Exploit
- https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-hgcf-4mq8-5266Exploit
Source: NIST NVD · Data may lag official sources by up to one minute