Critical severity · published Aug 6, 2026
CVE-2026-59118
Copilot Cowork Elevation of Privilege Vulnerability
9.3
CVSS
0.7%
EPSS
No
On KEV
Description
Improper authorization in Copilot Cowork allows an unauthorized attacker to elevate privileges over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 54% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CC
Copilot Cowork · Microsoft
All versions, or not specified · source: vendor
PA
Power Apps · Microsoft
All versions, or not specified · source: NVD