CVE-2026-83711Critical
Microsoft Azure Active Directory B2C Elevation of Privilege Vulnerability
Assessment
Authorization bypass through user-controlled key in Microsoft Azure Active Directory B2C allows an unauthorized attacker to elevate privileges over a network.
- Severity
- Critical
- CVSS base score
- 10.0CVSS:3.1/
AV:N/ AC:L/ PR:N/ UI:N/ S:C/ C:H/ I:H/ A:N/ E:U/ RL:O/ RC:C - Impact
- Elevation of Privilege
- EPSS, next 30 days
- 0.8%Higher than 55.3% of scored CVEs · FIRST model run 26 Sep 2026 · about EPSS
- Exploitability
- Not assessed
- Publicly disclosed
- No
- Customer action
- Not required (service-side fix)
- Component
- Microsoft Azure Active Directory B2C
- Weakness
- CWE-639: Authorization Bypass Through User-Controlled Key
- Issued by
- Microsoft
- Published
- 8 Sep 2026 · September 2026
- Last revised
- 8 Sep 2026
Updates that fix it
0 KBsNo KB listed
MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.
Affected products
Azure1 affected product
- Microsoft Azure Active Directory B2C