CVE-2026-45583

Name: CVE-2026-45583
Creator: NVD / NIST
Published: 2026-06-09T17:17:26.44+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 0.47%

Last modified Jun 17, 2026

CVE-2026-45583 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. Improper control of generation of code ('code injection') in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.. EPSS estimates a 0.47% chance of exploitation in the next 30 days.

Description

Improper control of generation of code ('code injection') in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.

Metrics

CVSS 3.1

8.1/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.47%

37.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-94

Affected Software

Vendor	Product	Versions	Update
Microsoft	Exchange Server	2016	Cumulative Update 23
Microsoft	Exchange Server	2019	Cumulative Update 14
Microsoft	Exchange Server Subscription Edition	< 15.02.2562.043	—

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45583Vendor Advisory

Timeline

Published: Jun 9, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is 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.

How severe is CVE-2026-45583?

CVE-2026-45583 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 0.47% probability of exploitation in the next 30 days.

How do I fix CVE-2026-45583?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-45583?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST