CVE-2026-42901
CVE-2026-42901 is a critical-severity vulnerability in Microsoft Entra Id with a CVSS 3.x base score of 10.0. 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-346.
Key facts
- Severity: Critical (CVSS 3.x base score 10.0)
- EPSS exploit prediction: 0% (38th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-31522
- Weakness: CWE-346
- Affected product: Microsoft Entra Id
- Published:
- Last modified:
Description
Origin validation error in Microsoft Entra ID allows an unauthorized attacker to elevate privileges over a network.
Frequently asked questions
- What is CVE-2026-42901?
- Origin validation error in Microsoft Entra ID allows an unauthorized attacker to elevate privileges over a network.
- How severe is CVE-2026-42901?
- CVE-2026-42901 has a CVSS 3.x base score of 10.0, 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 high.
- Is CVE-2026-42901 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-2026-42901?
- CVE-2026-42901 affects Microsoft Entra Id. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-42901?
- 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-2026-42901 have an EU (EUVD) identifier?
- Yes. CVE-2026-42901 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31522.
- When was CVE-2026-42901 published?
- CVE-2026-42901 was published on 2026-05-22 and last updated on 2026-07-23.
References
Affected products (1)
- cpe:2.3:a:microsoft:entra_id:-:*:*:*:*:*:*:*
More vulnerabilities in Microsoft Entra Id
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- CVE-2026-69851 — Critical (CVSS 9.9): Server-side request forgery (ssrf) in Azure Active Directory allows an authorized attacker to elevate privileges over a…
- CVE-2025-59246 — Critical (CVSS 9.8): Azure Entra ID Elevation of Privilege Vulnerability
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