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Microsoft Security Response CenterCVE-2026-48579

Microsoft Exchange Online Information Disclosure Vulnerability

CriticalVendor CVSS 9.1 / 10 1 CVE Published Jun 4, 2026 at 7:00 AM UTC

Summary

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

Products covered

  • Microsoft Exchange Online

Remediation

Separate remediation guidance was not included in the collected bulletin.

CVEs in this advisory 1

Updates

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

  3. Confirmed at the source

    Our collector saw this advisory during a later source check.