CVE-2026-33843
CVE-2026-33843 is a critical-severity vulnerability in Microsoft Entra Id with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-288.
Key facts
- Severity: Critical (CVSS 3.x base score 9.1)
- EPSS exploit prediction: 0% (38th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-31519
- Weakness: CWE-288
- Affected product: Microsoft Entra Id
- Published:
- Last modified:
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.
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.
- How severe is CVE-2026-33843?
- CVE-2026-33843 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
- Is CVE-2026-33843 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-33843?
- CVE-2026-33843 affects Microsoft Entra Id. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-33843?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2026-33843 have an EU (EUVD) identifier?
- Yes. CVE-2026-33843 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31519.
- When was CVE-2026-33843 published?
- CVE-2026-33843 was published on 2026-05-22 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:microsoft:entra_id:-:*:*:*:*:*:*:*
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