CVE-2026-42901 — Microsoft Entra ID Elevation of Privilege Vulnerability

Executive Summary

Origin validation error in Microsoft Entra ID allows an unauthorized attacker to elevate privileges over a network.

Overview

10

CVSS CRITICAL

Critical

MS Severity

Not Exploited

MS Exploit Status

N/A

MS Exploit Likelihood

Category Elevation of Privilege

Weakness CWE-346: Origin Validation Error

Released May 12 2026

Last Updated May 12 2026

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.00301 — 0.22562 percentile

NVD CVSS 10 CRITICAL — matches MSRC

CVSS Vector

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

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

None

USER INTERACTION

None

SCOPE

Changed

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 8.7

EPSS Score

0.00301

probability of exploitation in the next 30 days

0.22562 percentile - updated 2026-08-14

View on FIRST.org

Exploits & PoC

No public exploit or PoC has been linked for this CVE yet. When available, references are sourced from public repositories and may be unverified or non-functional — review carefully before use.

Detection Rules

No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.

Acknowledgments

Thomas Knudson
Sridhar Periyasamy

References

MSRC Advisory MITRE NVD