Affects Microsoft 365 Admin Center — widely used enterprise admin portal; can enable tenant admin takeover.
CVE-2026-62873
Crypto signature bypass in Microsoft 365 Admin Center enables remote privilege escalation.
Is CVE-2026-62873 being exploited?
Not confirmed. CVE-2026-62873 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.53% probability of exploitation in the next 30 days.
How severe is CVE-2026-62873?
CVE-2026-62873 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-62873?
Yes. A fix has been recorded for CVE-2026-62873. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-62873 affect?
CVE-2026-62873 affects Microsoft 365 Admin Center, Microsoft 365 tenant admin portals, Azure AD-linked admin consoles. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-62873?
Apply vendor patch immediately when available; rotate admin credentials and revoke/reissue keys.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Bypasses cryptographic signature verification to escalate privileges and obtain admin-level control of Microsoft 365 tenants.
Immediate action required