CVE-2026-87696
High
Description
Improper verification of cryptographic signature in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Microsoft Exchange Server
PublishedOct 13, 2026
First seenOct 13, 2026
Weakness typeCWE-347CWE-347
How to fix
Update
- microsoft exchange_server_subscription_edition15.02.2562.056 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft exchange_server | 2016, 2019 | — |
| microsoft exchange_server_subscription_edition | v < 15.02.2562.056 | 15.02.2562.056 |
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