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CVE-2026-42893Important

Microsoft Outlook for iOS Tampering Vulnerability

MSRC advisory NVD CVE.org

Assessment

Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to perform tampering over a network.

Severity
Important
CVSS base score
7.4CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N/E:U/RL:O/RC:C
Impact
Tampering
EPSS, next 30 days
0.7%Higher than 51.6% of scored CVEs · FIRST model run 29 Sep 2026 · about EPSS
Public exploit code
No Nuclei template lists it
Exploitability
Exploitation Less Likely
Publicly disclosed
No
Customer action
Required: apply the update
Component
M365 Copilot
Weakness
CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')
Issued by
Microsoft
Published
12 May 2026 · May 2026
Last revised
12 May 2026

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

Microsoft Office
1 affected product
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