CVE-2026-48579 CRITICAL

CVE-2026-48579: Microsoft Exchange Online Information Disclosure Vulnerability

Vendor Microsoft
Product Microsoft Exchange Online
Weakness CWE-285
Published June 4, 2026
Last update June 15, 2026
View on NVD All CVEs

CVSS base score

9.1/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

Improper authorization in Microsoft Exchange Online allows an unauthorized attacker to disclose information over a network.

Key dates

02Disclosure timeline

June 4, 2026 CVE published
June 15, 2026 Record updated