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Vulnerability record · CVE-2026-33843 · published 22 May 2026

CVE-2026-33843: Microsoft entra id authentication bypass via alternate path vulnerability

Microsoft · Entra Id

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

9.8 CVSS 3.1 Critical EPSS 0.87% · top 43.0% CWE-288 · Authentication bypass via alternate path
9.8CVSS 3.1 base score
0.87%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
23 Jul 2026Last modified by NVD

Description

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33843 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2026-69836Microsoft entra id deserialization of untrusted data vulnerabilityDeserialization of untrusted data in Microsoft Entra ID allows an unauthorized attacker to execute code over a network.EPSS 1.5%10.0CVE-2026-42901Microsoft entra id origin validation error vulnerabilityOrigin validation error in Microsoft Entra ID allows an unauthorized attacker to elevate privileges over a network.EPSS 0.46%10.0CVE-2026-35431Microsoft entra id server-side request forgery (ssrf) vulnerabilityServer-side request forgery (ssrf) in Microsoft Entra ID Entitlement Management allows an unauthorized attacker to perform spoofing over a network.EPSS 0.90%10.0CVE-2025-55241Microsoft entra id improper authentication vulnerabilityAzure Entra ID Elevation of Privilege VulnerabilityEPSS 1.6%9.9CVE-2026-69851Microsoft entra id server-side request forgery (ssrf) vulnerabilityServer-side request forgery (ssrf) in Azure Active Directory allows an authorized attacker to elevate privileges over a network.EPSS 0.78%9.8CVE-2026-62916Microsoft entra id authentication bypass via alternate path vulnerabilityAuthentication bypass using an alternate path or channel in Microsoft Entra ID allows an unauthorized attacker to elevate privileges over a network.EPSS 0.87%9.8CVE-2026-24305Microsoft entra id improper authorization vulnerabilityAzure Entra ID Elevation of Privilege VulnerabilityEPSS 0.55%9.8CVE-2025-59246Microsoft entra id missing authentication for critical function vulnerabilityAzure Entra ID Elevation of Privilege VulnerabilityEPSS 7.7%

Source: NIST National Vulnerability Database (record CVE-2026-33843), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.