Advisoriesby IbisMicrosoftCVE-2026-87696
Microsoft Exchange Server: privilege escalation
Fix: upgrade to 15.01.2507.077 or later (4 fixed versions below)
Improper verification of cryptographic signature in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Microsoft Exchange Server 2016 Cumulative Update 23 Product | >= 15.01.0.0, < 15.01.2507.077 | 15.01.2507.077 |
| Microsoft Exchange Server 2019 Cumulative Update 14 Product | >= 15.02.0.0, < 15.02.1544.050 | 15.02.1544.050 |
| Microsoft Exchange Server 2019 Cumulative Update 15 Product | >= 15.02.0.0, < 15.02.1748.055 | 15.02.1748.055 |
| Microsoft Exchange Server Subscription Edition RTM Product | >= 15.02.0.0, < 15.02.2562.056 | 15.02.2562.056 |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-347