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CVE-2026-77274 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:8.2 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-hgcf-4mq8-5266	CISA-ADP	ExploitVendor Advisory
https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460	[email protected]	Patch
https://github.com/sooperset/mcp-atlassian/pull/1448	[email protected]	Issue TrackingPatch
https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0	[email protected]	Release Notes
https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-hgcf-4mq8-5266	[email protected]	ExploitVendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-918	Server-Side Request Forgery (SSRF)	[email protected]

Affected Products

Product	Versions
mcp-atlassian mcp atlassian	< 0.22.0
CPE cpe:2.3:a:mcp-atlassian:mcp_atlassian:::::::: Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Sep 28, 2026	Initial Analysis	[email protected]
Sep 22, 2026	CVE Modified	CISA-ADP
Sep 22, 2026	New CVE Received	[email protected]