sooperset mcp-atlassian up to 0.21.x validate_url_for_ssrf X-Atlassian-Jira-Url/X-Atlassian-Confluence-Url server-side request forgery

Summaryinfo

A vulnerability labeled as problematic has been found in sooperset mcp-atlassian up to 0.21.x. This affects the function validate_url_for_ssrf. Executing a manipulation of the argument X-Atlassian-Jira-Url/X-Atlassian-Confluence-Url can lead to server-side request forgery. This vulnerability is handled as CVE-2026-77265. The attack can be executed remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in sooperset mcp-atlassian up to 0.21.x and classified as problematic. This vulnerability affects the function validate_url_for_ssrf. The manipulation of the argument X-Atlassian-Jira-Url/X-Atlassian-Confluence-Url with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-77265 since 08/20/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit.

Upgrading to version 0.22.0 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• sooperset

Name

• mcp-atlassian

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21

Website

• Product: https://github.com/sooperset/mcp-atlassian/

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