What’s Vulnerable › Vulnerabilities

CVE-2026-58617: M365 Copilot for iOS Elevation of Privilege Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-14 · updated 2026-11-01
• Weakness: CWE-284

Description

Improper access control in Microsoft 365 Copilot for iOS allows an unauthorized attacker to elevate privileges over a network.

Affected products

• Microsoft 365 Copilot: before 2.111.4 — fixed in 2.111.4
• Microsoft 365 Copilot: from 1.0 before 2.111.4 — fixed in 2.111.4

How to fix

Upgrade to a fixed version: Microsoft 365 Copilot 2.111.4; Microsoft 365 Copilot 2.111.4. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58617

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