CVE-2026-58617: Improper access control in Microsoft 365 Copilot for iOS allows an unauthorized attacker to elevate privileges

Q: How do I fix CVE-2026-58617?

365 copilot: upgrade to 2.111.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-58617 being exploited?

CVE-2026-58617 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-58617 affect?

CVE-2026-58617 affects 365 copilot. Severity is high (CVSS 8.1). Improper access control in Microsoft 365 Copilot for iOS allows an unauthorized attacker to elevate privileges over a network.

Q: How urgent is CVE-2026-58617?

Priority 47/100. High severity; On your watchlist

This month

HIGH 8.1WATCHLISTUPGRADE

CVE-2026-58617 is a high-severity flaw (CVSS 8.1) affecting 365 copilot. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 44%)
CISA exploited list	No
Weakness	CWE-284
Published	2026-07-14
Last modified	2026-10-24

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-14 18:18 UTCPublished CVE record published
2026-10-24 21:10 UTCUpdated Record last modified

microsoft 365 copilot UPGRADE

Affected: < 2.111.4

Fixed in: 2.111.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy 365-copilot || rpm -q 365-copilot || 365-copilot --version

2. UPGRADE to 2.111.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade 365-copilot

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade 365-copilot

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-58617?

365 copilot: upgrade to 2.111.4. Exact commands for each OS are on this page.

Is CVE-2026-58617 being exploited?

CVE-2026-58617 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-58617 affect?

CVE-2026-58617 affects 365 copilot. Severity is high (CVSS 8.1). Improper access control in Microsoft 365 Copilot for iOS allows an unauthorized attacker to elevate privileges over a network.

How urgent is CVE-2026-58617?

Priority 47/100. High severity; On your watchlist

Software pages

iOS vulnerabilities

Related CVEs

CVE-2026-50517 CRITICAL 9.9 MITIGATE Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network

References

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