RCE in Microsoft Exchange_server
CVE-2026-45583
Improper control of generation of code ('code injection') in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.
Vulnerability class: RCE (Remote Code Execution)
EPSS: 0.005 (38.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Microsoft Exchange_server — versions 2016, 2019
- Microsoft Exchange_server_subscription_edition
- Microsoft Exchange Server 2016 Cumulative Update 23 — versions 15.01.0.0
- Microsoft Exchange Server 2019 Cumulative Update 14 — versions 15.02.0.0
- Microsoft Exchange Server 2019 Cumulative Update 15 — versions 15.02.0.0
- Microsoft Exchange Server Subscription Edition Rtm — versions 15.02.0.0
Weakness classification (CWE)
References
- secure@microsoft.com (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-45583?
- CVE-2026-45583 is a high-severity vulnerability in Microsoft Exchange_server, classified under Code Injection. CVSS score: 7.5/10. Published 2026-06-09.
- How severe is CVE-2026-45583?
- High severity. CVSS v3 base score is 7.5 out of 10.