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CVE-2026-55145Moderate

Outlook Copilot Tampering Vulnerability

MSRC advisory NVD CVE.org

Assessment

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

Severity
Moderate
CVSS base score
6.3CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N/E:P/RL:O/RC:C
Impact
Tampering
EPSS, next 30 days
0.5%Higher than 42.2% of scored CVEs · FIRST model run 26 Sep 2026 · about EPSS
Exploitability
Not assessed
Publicly disclosed
No
Customer action
Required: apply the update
Component
Outlook Copilot
Weakness
CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')
Issued by
Microsoft
Published
14 Jul 2026 · July 2026
Last revised
14 Jul 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

Other
1 affected product
  • Microsoft Copilot
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