# CVE-2026-42901: Microsoft Entra ID privilege escalation via origin validation error

Source: https://junglewise.ai/threats/cve-2026-42901-microsoft-entra-id-privilege-escalation-via-origin-validation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-22. Updated: 2026-05-26  
License: CC BY 4.0 with a link back

CVE-2026-42901 · Severity: critical · CVSS 10 · Published 2026-05-22

A critical vulnerability has been identified in Microsoft Entra ID, the cloud-based identity and access management service used by organizations to manage user logins and permissions. An unauthorized attacker could exploit this flaw over the network to gain elevated administrative privileges. This could lead to a total compromise of the organization's identity infrastructure, allowing unauthorized access to sensitive data and cloud resources.

Technologies: [Microsoft Entra ID](https://junglewise.ai/threats/technologies/entra-id). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-42901 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-42901 being exploited in the wild.

**How severe is CVE-2026-42901?** Critical severity, with a CVSS score of 10, published 22 May 2026.

**Which products and versions are affected?** Microsoft Entra ID.

**Is there a fix for CVE-2026-42901?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-42901 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-42901?** Check whether you run Microsoft Entra ID. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

Microsoft Entra ID is vulnerable to a privilege escalation flaw due to an origin validation error (CWE-346). The vulnerability allows a remote, unauthenticated attacker to bypass security boundaries and gain elevated permissions within the directory service. According to the CVSS 3.1 vector, the attack is low complexity, requires no user interaction, and has a 'Changed' scope, indicating the attacker can impact components beyond the immediate security scope of the vulnerable service. As this is an exclusively hosted service, Microsoft typically manages the deployment of fixes on the backend.

## Affected products

- Microsoft Entra ID

## Timeline

- 2026-05-22: disclosed
- 2026-05-22: advisory: MSRC advisory published

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42901](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42901)

## Related threats

- [Microsoft Entra ID privilege escalation via missing authorization](https://junglewise.ai/threats/cve-2026-83941-microsoft-entra-id-privilege-escalation-via-missing-authorization)
- [Microsoft Entra ID authentication bypass and privilege escalation](https://junglewise.ai/threats/cve-2026-62916-microsoft-entra-id-authentication-bypass-and-privilege-escalation)
- [Microsoft Azure Active Directory SSRF privilege escalation](https://junglewise.ai/threats/cve-2026-69851-microsoft-azure-active-directory-ssrf-privilege-escalation)
- [Microsoft Entra ID deserialization of untrusted data remote code execution](https://junglewise.ai/threats/cve-2026-69836-microsoft-entra-id-deserialization-of-untrusted-data-remote-code)
- [Insufficient verification of data authenticity in Azure Entra ID allows an authorized attacker to perform spoofing over a network.](https://junglewise.ai/threats/cve-2026-62869-insufficient-verification-of-data-authenticity-in-azure-entra-id)