8.8
High
CVE-2026-77910 Incorrect authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network
Description
Incorrect authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Microsoft Exchange Server 2016 Cumulative Update 23 15.01 | 15.01.0.0 → < 15.01.2507.077 | 15.01.2507.077 |
| Microsoft Exchange Server 2019 Cumulative Update 14 15.02 | 15.02.0.0 → < 15.02.1544.050 | 15.02.1544.050 |
| Microsoft Exchange Server 2019 Cumulative Update 15 15.02 | 15.02.0.0 → < 15.02.1748.055 | 15.02.1748.055 |
| Microsoft Exchange Server Subscription Edition RTM 15.02 | 15.02.0.0 → < 15.02.2562.056 | 15.02.2562.056 |
Other CVEs of Microsoft Exchange Server 2016 Cumulative Update 23
The 88 CVEs of Microsoft Exchange Server 2016 Cumulative Update 23 →
CVE-2026-70279
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows…
9.3
Critical
CVE-2026-87696
Improper verification of cryptographic signature in Microsoft Exchange Server allows an authorized attacker to elevate…
7.5
High
CVE-2026-87695
Inclusion of functionality from untrusted control sphere in Microsoft Exchange Server allows an authorized attacker to…
7.8
High
CVE-2026-70571
Stack-based buffer overflow in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network
8.1
High