High severity · published May 7, 2026
CVE-2026-34327
Microsoft Partner Center Spoofing Vulnerability
8.2
CVSS
0.6%
EPSS
No
On KEV
Description
Externally controlled reference to a resource in another sphere in Microsoft Partner Center allows an unauthorized attacker to perform spoofing over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 50% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MP
Microsoft Partner Center · Microsoft
All versions, or not specified · source: vendor
PC
Partner Center · Microsoft
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34327
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-34327
Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34327
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