Name: CVE-2026-45503: Improper Authorization
Creator: Rapid7
Published: 2026-06-09T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-45503, CWE-285, CWE-918, CVSS 8.1, EPSS 0.00863

Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.

CVSS Details

CVSS 3.1 Base Score: 8.1
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Microsoft Exchange	—	Download and install Microsoft KB5103214Download and install Microsoft KB5103213Download and install Microsoft KB5103215Download and install Microsoft KB5103212	Jun 9, 2026	Jun 9, 2026

Prioritise with Active Threat Intelligence

With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.

Explore Intelligence Hub

MDR Buyer's Guide

Global Threat Landscape Report

Grow your business

CVSS Details

Covered by Rapid7

Prioritise with Active Threat Intelligence