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CVE-2026-77262

8.6 · HIGH

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

Published Sep 22, 2026mcp-atlassianCWE-22EPSS 0.56%

Overview

CVE-2026-77262 is a high-severity vulnerability affecting mcp-atlassian mcp_atlassian. It was published on September 22, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. 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, confluence_upload_attachment accepts an attacker-controlled file_path and does not apply the path restriction added for the earlier download vulnerability. A caller can traverse outside the workspace and upload arbitrary server-readable files to Confluence. The advisory traces the vulnerable input and processing flow through confluence_upload_attachment, file_path, and CVE-2026-27825, 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-p6hp-93wp-fh6pGitHubgithub.com/sooperset/mcp-atlassian/security/advisories/GHSA-p6hp-93wp-fh6p

How CyberStrike helps

Frequently asked questions

What is CVE-2026-77262?

CVE-2026-77262 is a high-severity vulnerability affecting mcp-atlassian mcp_atlassian. It was published on September 22, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).

How severe is CVE-2026-77262?

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-77262?

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-2026-77262?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-77262 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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