CVE-2026-34327

HIGHNVD 8.28.2—

8.2

Externally controlled reference to a resource in another sphere in Microsoft Partner Center allows an unauthorized attacker to perform spoofing over a network.

CVSS v3: 8.2
EG Score: 8.2(high)
EPSS: 36.5%
KEV: Not listed

Published

May 7, 2026

Last Modified

May 8, 2026

Advisory Details (1)

Auto-updated May 7, 2026

Patch available. Sources: microsoft.

microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34327

Vendor Advisories for CVE-2026-34327(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

CVE-2026-34327
Microsoft Security Response Center (MSRC)Spoofing
Microsoft Partner Center Spoofing Vulnerability

Frequently asked(5)

What is CVE-2026-34327?

CVE-2026-34327 is a high vulnerability published on May 7, 2026. Externally controlled reference to a resource in another sphere in Microsoft Partner Center allows an unauthorized attacker to perform spoofing over a network.

When was CVE-2026-34327 disclosed?

CVE-2026-34327 was first published in the National Vulnerability Database on May 7, 2026, with the most recent update on May 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-34327 actively exploited?

CVE-2026-34327 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 36.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-34327?

CVE-2026-34327 has a CVSS v3 base score of 8.2 (NVD).

How do I remediate CVE-2026-34327?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34327, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2026-34327

📅 Published

🔄 Last Modified

📋 Advisory Details (1)

Security Update Guide - Microsoft Security Response Center

📣 Vendor Advisories for CVE-2026-34327(1)

❓ Frequently asked(5)