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CVE-2026-71424

9.6 · CRITICAL

Onyx is an open-source AI platform.

Published Aug 17, 2026CWE-200EPSS 0.49%

Overview

CVE-2026-71424 is a critical-severity vulnerability. It was published on August 17, 2026 and has a CVSS 3.1 base score of 9.6 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.6, rated CRITICAL. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Onyx is an open-source AI platform. Prior to 3.1.10, 3.2.14, and 4.0.0, Onyx's GET /api/mcp/servers and GET /api/mcp/servers/persona/{persona_id} endpoints expose another user's OAuth Authorization header because OnyxTokenStorage.set_tokens and OnyxTokenStorage.set_client_info in backend/onyx/server/features/mcp/api.py copy per-user tokens into a shared admin MCPConnectionConfig row and _db_mcp_server_to_api_mcp_server returns that row through auth_template.headers to any BASIC_ACCESS user. This issue is fixed in versions 3.1.10, 3.2.14, and 4.0.0.

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/onyx-dot-app/onyx/commit/3f3d79d1a7722fdc84a1c61c8aa830d890017e9eGitHubgithub.com/onyx-dot-app/onyx/commit/4001cedd0a8968723bfe95dd188914ed56777910GitHubgithub.com/onyx-dot-app/onyx/commit/b103937888fd5008067c2bb6eb6e5424576394f2GitHubgithub.com/onyx-dot-app/onyx/pull/11238GitHubgithub.com/onyx-dot-app/onyx/pull/11242GitHubgithub.com/onyx-dot-app/onyx/pull/11243GitHubgithub.com/onyx-dot-app/onyx/releases/tag/v4.0.0GitHubgithub.com/onyx-dot-app/onyx/security/advisories/GHSA-q62f-rv3h-f822

How CyberStrike helps

Frequently asked questions

What is CVE-2026-71424?

CVE-2026-71424 is a critical-severity vulnerability. It was published on August 17, 2026 and has a CVSS 3.1 base score of 9.6 (CRITICAL).

How severe is CVE-2026-71424?

This vulnerability has a CVSS 3.1 base score of 9.6, rated CRITICAL. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-71424?

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-2026-71424?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-71424 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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