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CVE-2026-73498

7.7 · HIGH

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

Published Aug 12, 2026CWE-22EPSS 0.48%

Overview

CVE-2026-73498 is a high-severity vulnerability. It was published on August 12, 2026 and has a CVSS 3.1 base score of 7.7 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is 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 passes its client-supplied file_path directly to open(file_path, "rb") in src/mcp_atlassian/confluence/attachments.py through _upload_attachment_direct() without calling validate_safe_path. An authenticated MCP client can read any file accessible to the server process and exfiltrate it to Confluence as an attachment. If an AI agent can be induced to call the tool through untrusted content, the same flaw can disclose server environment variables such as CONFLUENCE_API_TOKEN and other credentials. This issue is fixed in version 0.22.0.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

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-g5r6-gv6m-f5jvGitHubgithub.com/sooperset/mcp-atlassian/security/advisories/GHSA-g5r6-gv6m-f5jv

How CyberStrike helps

Frequently asked questions

What is CVE-2026-73498?

CVE-2026-73498 is a high-severity vulnerability. It was published on August 12, 2026 and has a CVSS 3.1 base score of 7.7 (HIGH).

How severe is CVE-2026-73498?

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-73498?

Check the references section for vendor advisories, patches, and mitigation guidance. 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-2026-73498?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-73498 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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