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CVE-2026-77244

10.0 · CRITICAL

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira).

Published Sep 22, 2026mcp-atlassianCWE-287EPSS 0.35%

Overview

CVE-2026-77244 is a critical-severity vulnerability affecting mcp-atlassian mcp_atlassian. It was published on September 22, 2026 and has a CVSS 3.1 base score of 10.0 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from mcp-atlassian. Update mcp_atlassian to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
mcp-atlassianmcp_atlassian>= 0, < 0.22.0Affected

References

GitHubgithub.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460GitHubgithub.com/sooperset/mcp-atlassian/pull/1448GitHubgithub.com/sooperset/mcp-atlassian/releases/tag/v0.22.0GitHubgithub.com/sooperset/mcp-atlassian/security/advisories/GHSA-wrhw-j3f9-8vc6

How CyberStrike helps

Frequently asked questions

What is CVE-2026-77244?

CVE-2026-77244 is a critical-severity vulnerability affecting mcp-atlassian mcp_atlassian. It was published on September 22, 2026 and has a CVSS 3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2026-77244?

This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-77244?

Check the references section for vendor advisories and patches from mcp-atlassian. Update mcp_atlassian to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-77244?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-77244 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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