CVE-2026-87696
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Improper Cryptographic Signature Verification in Microsoft Exchange Server
Vulnerability report for CVE-2026-87696, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-13
Last updated on: 2026-10-13
Assigner: Microsoft Corporation
Description
Description
Improper verification of cryptographic signature in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Microsoft | Microsoft | Exchange Server 2016 Cumulative Update 23 15.01.0.0 |
| Microsoft | Microsoft | Exchange Server 2019 Cumulative Update 14 15.02.0.0 |
| Microsoft | Microsoft | Exchange Server 2019 Cumulative Update 15 15.02.0.0 |
| Microsoft | Microsoft | Exchange Server Subscription Edition RTM 15.02.0.0 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-347 | The product does not verify, or incorrectly verifies, the cryptographic signature for data. |
