Critical severity · published Mar 19, 2026
CVE-2026-26137
Microsoft Exchange Elevation of Privilege Vulnerability
9.9
CVSS
0.5%
EPSS
No
On KEV
Description
Server-side request forgery (ssrf) in Microsoft Exchange allows an authorized attacker to elevate privileges over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
Low
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 46% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ME
Microsoft Exchange Online · Microsoft
All versions, or not specified · source: vendor
3C
365 Copilot Chat · Microsoft
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-26137
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-26137
Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26137
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