PT-2026-46406 · Microsoft · Exchange Online

Published 2026-06-04 · Updated 2026-06-04 · CVE-2026-48579

Mitre

CVSS v3.1

9.1

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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

Fix

Improper Authorization

Weakness Enumeration

CWE-285

Related Identifiers

CVE-2026-48579

Affected Products

Exchange Online

References · 2

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-48579 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-48579 · Security Note