CVE-2026-77244
CVE-2026-77244
10.0
CriticalPublished:
Last updated:
Source:security-advisories@github.com
Analyzed
CVSS Vector
v3.1- Attack Vector
- Network
- Attack Complexity
- Low
- Privileges Required
- None
- User Interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Description
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the HTTP transport accepts requests without a verified user identity and downstream fetcher construction falls back to the operator's globally configured Jira or Confluence credentials. A network client that can reach the MCP endpoint can invoke Atlassian tools as the operator, including read and write operations available to that account. The advisory traces the vulnerable input and processing flow through UserTokenMiddleware, AtlassianOpaqueTokenVerifier, _get_fetcher, and streamable-http, 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-wrhw-j3f9-8vc6