CVE-2026-33843

CRITICAL

Published May 22, 2026 Modified May 27, 2026 CWE-288

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 v3.1 Score

9.1

CRITICAL

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

EPSS — Exploit Prediction

0.0005

Probability of exploitation

0.16%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-288 CWE-288

Affected Products

Vendor	Product	Versions
microsoft	entra_id	All

References

Advisories & Patches

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

Frequently Asked Questions

What is CVE-2026-33843? +

Authentication bypass using an alternate path or channel in Microsoft Azure Active Directory B2C allows an unauthorized attacker to elevate privileges over a network. It has a CVSS v3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-33843? +

CVE-2026-33843 has a CVSS v3.1 score of 9.1 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0005, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-33843? +

CVE-2026-33843 affects products from microsoft, specifically: entra_id. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-33843? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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