CVE-2026-77247
CVE-2026-77247
8.3
HighPublished:
Last updated:
Source:security-advisories@github.com
Analyzed
Weakness (CWE)
CVSS Vector
v4.0- Attack Vector
- Network
- Attack Complexity
- Low
- Attack Requirements
- None
- Privileges Required
- Low
- User Interaction
- None
- Confidentiality (Vulnerable)
- High
- Integrity (Vulnerable)
- None
- Availability (Vulnerable)
- None
- Confidentiality (Subsequent)
- High
- Integrity (Subsequent)
- None
- Availability (Subsequent)
- None
Description
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, Jira and Confluence upload tools interpret caller-controlled path arguments on the MCP server and open those files before sending them as attachments. In remote or multi-user deployments, a permitted client can disclose host files without shell or direct filesystem access. The advisory traces the vulnerable input and processing flow through AttachmentsMixin.upload_attachment, AttachmentsMixin.upload_attachments, file_path, file_paths, and jira update_issue, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.
References
security-advisories@github.com
https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460security-advisories@github.com
https://github.com/sooperset/mcp-atlassian/pull/1448security-advisories@github.com
https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0security-advisories@github.com
https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-f6pj-qv47-g96w134c704f-9b21-4f2e-91b3-4a467353bcc0
https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-f6pj-qv47-g96w