CVE-2026-45503

Name: CVE-2026-45503
Creator: NVD / NIST
Published: 2026-06-09T17:17:26.137+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.45%

Last modified Jun 17, 2026

CVE-2026-45503 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.. EPSS estimates a 0.45% chance of exploitation in the next 30 days.

Description

Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.45%

36.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

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-2026-45503Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2026-45503?

Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.

How severe is CVE-2026-45503?

CVE-2026-45503 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.45% probability of exploitation in the next 30 days.

How do I fix CVE-2026-45503?

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-2026-45503?

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

Scan your code now

Source: NVD / NIST