What’s Vulnerable › Vulnerabilities
CVE-2026-69375: Microsoft Exchange Server Tampering Vulnerability
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.6% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-08 · updated 2026-10-30
- Weakness: CWE-639
Description
Authorization bypass through user-controlled key in Microsoft Exchange Server allows an authorized attacker to perform tampering 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 15.02.2562.049 — fixed in 15.02.2562.049
- Microsoft Exchange Server 2016 Cumulative Update 23: from 15.01.0.0 before 15.01.2507.073 — fixed in 15.01.2507.073
- Microsoft Exchange Server 2019 Cumulative Update 14: from 15.02.0.0 before 15.02.1544.046 — fixed in 15.02.1544.046
- Microsoft Exchange Server 2019 Cumulative Update 15: from 15.02.0.0 before 15.02.1748.051 — fixed in 15.02.1748.051
- Microsoft Exchange Server Subscription Edition RTM: from 15.02.0.0 before 15.02.2562.049 — fixed in 15.02.2562.049
How to fix
Upgrade to a fixed version: Microsoft Exchange Server Subscription Edition 15.02.2562.049; Microsoft Exchange Server 2016 Cumulative Update 23 15.01.2507.073; Microsoft Exchange Server 2019 Cumulative Update 14 15.02.1544.046; Microsoft Exchange Server 2019 Cumulative Update 15 15.02.1748.051; Microsoft Exchange Server Subscription Edition RTM 15.02.2562.049. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-69375 or the next vulnerability affects your stack