What is CVE-2026-83711?

CVE-2026-83711 is a critical-severity vulnerability, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 10.0/10. Published 2026-09-03.

How severe is CVE-2026-83711?

Critical severity. CVSS v3 base score is 10.0 out of 10.

CVE-2026-83711

CVE-2026-83711

Authorization bypass through user-controlled key in Microsoft Azure Active Directory B2C allows an unauthorized attacker to elevate privileges over a network.

Vulnerability class: IDOR (Insecure Direct Object Reference)

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N.

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

secure@microsoft.com

Frequently asked questions

What is CVE-2026-83711?: CVE-2026-83711 is a critical-severity vulnerability, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 10.0/10. Published 2026-09-03.
How severe is CVE-2026-83711?: Critical severity. CVSS v3 base score is 10.0 out of 10.