What is CVE-2026-33843?

CVE-2026-33843 is a critical-severity vulnerability in Microsoft Entra_id, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 9.1/10. Published 2026-05-22.

How severe is CVE-2026-33843?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Microsoft Entra_id

CVE-2026-33843

Authentication bypass using an alternate path or channel in Microsoft Azure Active Directory B2C allows an unauthorized attacker to elevate privileges over a network.

EPSS: 0.001 (22.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Microsoft Entra_id
Microsoft Entra

Weakness classification (CWE)

CWE-288 — Authentication Bypass Using an Alternate Path or Channel

References

secure@microsoft.com (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-33843?: CVE-2026-33843 is a critical-severity vulnerability in Microsoft Entra_id, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 9.1/10. Published 2026-05-22.
How severe is CVE-2026-33843?: Critical severity. CVSS v3 base score is 9.1 out of 10.