Outlook.com vulnerability

What happened

Improper neutralization of special elements used in a command ('command injection') in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.

Affected versions

Outlook.com: 1.0.0 through before 20260925.100 (custom); 10.0.14393.0 through before 10.0.14393.9612 (custom); 10.0.17763.0 through before 10.0.17763.9376 (custom); 10.0.19044.0 through before 10.0.19044.7807 (custom); 10.0.19045.0 through before 10.0.19044.7807 (custom); 10.0.22631.0 through before 10.0.22631.7652 (custom); 10.0.26100.0 through before 10.0.26100.9711 (custom); 10.0.26200.0 through before 10.0.26200.9711 (custom); 10.0.28000.0 through before 10.0.28000.3231 (custom); 10.0.26300.0 through before 10.0.26300.9711 (custom); 6.3.9600.0 through before 6.3.9600.23470 (custom); 10.0.20348.0 through before 10.0.20348.5761 (custom); 10.0.26100.0 through before 10.0.26100.33650 (custom) Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.