Description
Improper verification of cryptographic signature in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 23 | 15.01.0.0 – < 15.01.2507.077 | 15.01.2507.077 |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 14 | 15.02.0.0 – < 15.02.1544.050 | 15.02.1544.050 |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 15 | 15.02.0.0 – < 15.02.1748.055 | 15.02.1748.055 |
| Microsoft | Microsoft Exchange Server Subscription Edition RTM | 15.02.0.0 – < 15.02.2562.056 | 15.02.2562.056 |
Advisories 4
- WID-SEC-2026-3892 Microsoft Windows und Windows Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 8, 2026
- WID-SEC-2026-3920 Microsoft Exchange: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 13, 2026
- NCSC-2026-0419 Kwetsbaarheden verholpen in Microsoft Excange Server NCSC-NL (Netherlands) · Oct 13, 2026
- MSRC-CVE-2026-87696 Microsoft Exchange Server Elevation of Privilege Vulnerability Microsoft Security Response Center · Oct 13, 2026
References
- Microsoft Exchange Server Elevation of Privilege Vulnerability vendor-advisory patch