What’s Vulnerable › Vulnerabilities
CVE-2026-96940: Microsoft Exchange Server Elevation of Privilege Vulnerability
- Severity: high (CVSS 8.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 2.7% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-02 · updated 2026-10-31
- Weakness: CWE-1390
Description
Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Affected products
- Microsoft Exchange Server: 2016-cumulative_update_23, 2019-cumulative_update_14, 2019-cumulative_update_15
- Microsoft Exchange Server Subscription Edition: before 15.02.2562.053 — fixed in 15.02.2562.053
- Microsoft Exchange Server 2016 Cumulative Update 23: from 15.01.0.0 before 15.01.2507.075 — fixed in 15.01.2507.075
- Microsoft Exchange Server 2019 Cumulative Update 14: from 15.02.0.0 before 15.02.1544.048 — fixed in 15.02.1544.048
- Microsoft Exchange Server 2019 Cumulative Update 15: from 15.02.0.0 before 15.02.1748.053 — fixed in 15.02.1748.053
- Microsoft Exchange Server Subscription Edition RTM: from 15.02.0.0 before 15.02.2562.053 — fixed in 15.02.2562.053
How to fix
Upgrade to a fixed version: Microsoft Exchange Server Subscription Edition 15.02.2562.053; Microsoft Exchange Server 2016 Cumulative Update 23 15.01.2507.075; Microsoft Exchange Server 2019 Cumulative Update 14 15.02.1544.048; Microsoft Exchange Server 2019 Cumulative Update 15 15.02.1748.053; Microsoft Exchange Server Subscription Edition RTM 15.02.2562.053. Check the vendor advisory for mitigations.
In the news
References
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