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CVE-2026-62873: Microsoft 365 Admin Center Elevation of Privilege Vulnerability

criticalCVSS 9.8CVE-2026-62873
Improper verification of cryptographic signature in Microsoft 365 Admin Center allows an unauthorized attacker to elevate privileges over a network.

CSIRTS triage

vendor: Microsoftproduct: Microsoft 365 Admin CenterAuthentication bypassPrivilege escalation
What
Improper verification of cryptographic signatures allows unauthorized privilege escalation over a network.
Who is affected
All Microsoft 365 Admin Center deployments are affected.
Urgency
Critical severity (CVSS 9.8) with no current exploitation reported; urgent patching essential.
Action
Apply Microsoft security updates for 365 Admin Center and validate signature verification implementation.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
critical — CVSS 9.8
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62873

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-62873coverage & exploitation statusNVD · CVE.org

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