CVE-2026-111771 in Model Context Protocol

Prediction

by VulDB Data Team • 10/20/2026

A weakness has been identified in <a href="/product/model_context_protocol">Model Context Protocol</a>. This issue affects the function <code>requireBearerAuth/verifyBearerToken/verifyAccessToken</code> of the component <em>sdk/server/express/server-legacy</em>. This manipulation of the argument <em>aud</em> causes improper authorization. The attack can be initiated remotely.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

• Moderation: accepted
• Entry: VDB-423032
• CWE: CWE-285 (confirmed)
• CVSS: 6.3 (VulDB)
• EPSS: 0.00000
• KEV: no
• Activities: very low

Sources

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-111771
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-111771
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-111771/