Critical severity · published Aug 20, 2026
CVE-2026-65801
Microsoft Exchange Online Elevation of Privilege Vulnerability
10.0
CVSS
0.9%
EPSS
No
On KEV
Description
Server-side request forgery (ssrf) in Microsoft Exchange Online allows an unauthorized attacker to elevate privileges over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 60% 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
EO
Exchange Online · Microsoft
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-65801
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-65801
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65801
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