CVE-2026-87696

Improper verification of cryptographic signature in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Score

CVSS 3.1 7.5 High

Status

Analyzed - secure@microsoft.com

Published

2026-10-13

Last modified

2026-10-28

Weaknesses

CWE-347

Affected products

• Exchange Server (Microsoft)
• Exchange Server 2016 (Microsoft)
• Exchange Server 2019 (Microsoft)
• Exchange Server Se (Microsoft)
• Exchange Server Subscription Edition (Microsoft)

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-87696