CVE-2026-42895: Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allow

This month

MEDIUM 6.5WATCHLISTMITIGATE

CVE-2026-42895 is a medium-severity flaw (CVSS 6.5) affecting 365 copilot. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unauthorized attacker to perform tampering over a network.

Why this priority

On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-77
Published	2026-06-19
Last modified	2026-10-25

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-19 21:16 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

microsoft 365 copilot MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

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

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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-2026-42895?

365 copilot: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-42895 being exploited?

CVE-2026-42895 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-2026-42895 affect?

CVE-2026-42895 affects 365 copilot. Severity is medium (CVSS 6.5). Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unauthorized attacker to perform tampering over a network.

How urgent is CVE-2026-42895?

Priority 41/100. On your watchlist

Related CVEs

CVE-2026-42831 HIGH 7.8 UPGRADE DOWNGRADE Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
CVE-2026-47645 HIGH 8.8 MITIGATE Url redirection to untrusted site ('open redirect') in Microsoft 365 Copilot's Business Chat allows an unautho
CVE-2026-41106 CRITICAL 9.3 MITIGATE Url redirection to untrusted site ('open redirect') in M365 Copilot allows an unauthorized attacker to elevate
CVE-2026-58617 HIGH 8.1 UPGRADE Improper access control in Microsoft 365 Copilot for iOS allows an unauthorized attacker to elevate privileges
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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