Critical severity · published Jul 14, 2026
CVE-2026-58617
M365 Copilot for iOS Elevation of Privilege Vulnerability
9.8
CVSS
0.8%
EPSS
No
On KEV
Description
Improper access control in Microsoft 365 Copilot for iOS allows an unauthorized attacker to elevate privileges over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 56% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
M3
Microsoft 365 Copilot for iOS · Microsoft
1.0 before 2.111.4 · source: vendor
3C
365 Copilot · Microsoft
before 2.111.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-58617
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-58617
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58617
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