CVE-2026-48579

CRITICAL

Microsoft Exchange Online Information Disclosure Vulnerability

Title source: cna
STIX 2.1

Description

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

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory patch
Microsoft Exchange Online Information Disclosure Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-48579

Scores

CVSS v3 9.1
EPSS 0.0057
EPSS Percentile 42.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact total

Details

CWE
CWE-285
Status published
Products (2)
microsoft/exchange_online
Microsoft/Microsoft Exchange Online -
Published Jun 04, 2026
Tracked Since Jun 05, 2026