CVE-2026-83711CWE-639

CVE-2026-83711

Critical · published September 4, 2026

CVSS v3.1
10.0
EPSS
1%
Percentile
56.1
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
10.0 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00798 · 56.1th percentile
Weakness
CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2026-09-04T03:17Z
Affected products (1)
ProductVersionsFixed in
microsoft/azure_active_directory_b2call versions—
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83711 · [email protected]
EPSS history
Timeline
  • 05 SEP 03:44Z
    EPSS moved — → 1%
    epss
  • 03 SEP 22:59Z
    Microsoft Azure Active Directory B2C Elevation of Privilege Vulnerability
    cvelistv5