What’s Vulnerable › Vulnerabilities

CVE-2026-83711: Microsoft Azure Active Directory B2C Elevation of Privilege Vulnerability

• Severity: critical (CVSS 10.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-03 · updated 2026-10-31
• Weakness: CWE-639

Description

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

Affected products

• Microsoft Azure Active Directory B2C: all versions
• Microsoft Entra: all versions

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83711

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