Microsoft Exchange Server 2016 Cumulative Update 23 vulnerability

What happened

External control of file name or path in Microsoft Exchange Server allows an authorized attacker to execute code over a network.

Affected versions

Microsoft Exchange Server 2016 Cumulative Update 23: 15.01.0.0 through before 15.01.2507.073 (custom); 15.02.0.0 through before 15.02.1544.046 (custom); 15.02.0.0 through before 15.02.1748.051 (custom); 15.02.0.0 through before 15.02.2562.049 (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.