Review reviewCritical

CVE-2026-58617

Microsoft Microsoft 365 Copilot for iOS, 365 copilot

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

CVSS
9.8
EPSS
0.67%
47.8% percentile
CISA KEV
Not listed
Published
2026.07.15
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.67%
Technical severityCVSS 9.8

Vulnerability overview

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

Affected product and versions

Product
Microsoft Microsoft 365 Copilot for iOS, 365 copilot
Affected versions
>= 1.0 < 2.111.4, < 2.111.4
Fixed versions
2.111.4

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Microsoft Microsoft 365 Copilot for iOS, 365 copilot and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-284
CVE-2026-58617 — Microsoft Microsoft 365 Copilot for iOS, 365 copilot | SECUFOCUS NOW