What is CVE-2026-34327?

CVE-2026-34327 is a high-severity vulnerability in Microsoft Partner Center, classified under Externally Controlled Reference to a Resource in Another Sphere. CVSS score: 8.2/10. Published 2026-05-07.

How severe is CVE-2026-34327?

High severity. CVSS v3 base score is 8.2 out of 10.

Vulnerability in Microsoft Partner Center

CVE-2026-34327

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

EPSS: 0.002 (44.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.

Affected products

Microsoft Partner Center
Microsoft Partner_center

Weakness classification (CWE)

CWE-610 — Externally Controlled Reference to a Resource in Another Sphere

References

Microsoft Partner Center Spoofing Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-34327?: CVE-2026-34327 is a high-severity vulnerability in Microsoft Partner Center, classified under Externally Controlled Reference to a Resource in Another Sphere. CVSS score: 8.2/10. Published 2026-05-07.
How severe is CVE-2026-34327?: High severity. CVSS v3 base score is 8.2 out of 10.