CVE-2026-48579CWE-285

Microsoft Exchange Online Information Disclosure Vulnerability

Critical · published June 4, 2026

CVSS v3.1
9.1
EPSS
1%
Percentile
62.5
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
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
CVSS v4.0
Not supplied
EPSS
0.00999 · 62.5th percentile
Weakness
CWE-285 · Improper Authorization
Published
2026-06-04T22:00Z
EPSS history
Timeline
  • 04 JUN 22:00Z
    Microsoft Exchange Online Information Disclosure Vulnerability
    cvelistv5