CVE-2026-26137

Name: CVE-2026-26137
Creator: NVD / NIST
Published: 2026-03-19T21:17:08.05+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.9/10EPSS 0.54%

Last modified Jun 17, 2026

CVE-2026-26137 is a critical-severity vulnerability rated 9.9/10 on the CVSS scale. Server-side request forgery (ssrf) in Microsoft Exchange allows an authorized attacker to elevate privileges over a network.. EPSS estimates a 0.54% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

9.9/10

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

EPSS Probability

0.54%

41.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-918

Affected Software

Vendor	Product	Versions
Microsoft	365 Copilot Chat	All versions

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26137Vendor Advisory

Timeline

Published: Mar 19, 2026
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2026-26137?

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

How severe is CVE-2026-26137?

CVE-2026-26137 has a CVSS score of 9.9/10 (CRITICAL severity). The EPSS model estimates a 0.54% probability of exploitation in the next 30 days.

How do I fix CVE-2026-26137?

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-2026-26137?

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

Scan your code now

Source: NVD / NIST