CVE-2026-48582 — Microsoft Exchange Online Elevation of Privilege Vulnerability

Executive Summary

Missing authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.

Overview

9.6

CVSS CRITICAL

Critical

MS Severity

Not Exploited

MS Exploit Status

N/A

MS Exploit Likelihood

Category Elevation of Privilege

Released Jun 9 2026

Last Updated Jun 9 2026

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

CVSS Vector

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Changed

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

None

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 8.3

EPSS Score

No EPSS score available for this CVE.

View on FIRST.org

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

Henrique Pereira with Microsoft

References

MSRC Advisory MITRE NVD