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CVE-2026-77265 Details

Description

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, header-supplied Jira or Confluence URLs are resolved and validated before the HTTP client resolves the hostname again for the connection. An unauthenticated caller can use a DNS-rebinding hostname that returns a public address during validation and an internal address during connection, causing requests to internal or metadata services. The advisory traces the vulnerable input and processing flow through X-Atlassian-Jira-Url, X-Atlassian-Confluence-Url, validate_url_for_ssrf, and DNS rebinding, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CNA: [email protected]CVSS-B:5.9 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/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-49xv-9743-pw8w	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-49xv-9743-pw8w	[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 29, 2026	Initial Analysis	[email protected]
Sep 28, 2026	CVE Modified	CISA-ADP
Sep 22, 2026	New CVE Received	[email protected]