14 October 2026
Reference: CVE-2023-23397
1. What is being reported?
The vulnerability, tracked as CVE-2023-23397, is an elevation of privilege issue in Microsoft Outlook. This means an attacker could use this flaw to run harmful code on your computer remotely, potentially gaining full control without your knowledge.
2. What this means in plain English
If exploited, this flaw could let cybercriminals access your business data, send emails pretending to be you, or install malicious software. This puts your business information and reputation at risk.
3. Could this affect a small business?
Any small business or organisation using Microsoft Outlook on Windows or Exchange servers could be affected. If you use Outlook for email, you should consider yourself at risk until this is fixed.
4. What to do now
- Contact your IT provider or software supplier immediately to confirm if patches for this vulnerability have been applied.
- Ensure all Microsoft Outlook and related software updates are installed as soon as they become available.
- Be cautious with unexpected emails or attachments, even if they appear to come from known contacts.
- Review your organisation’s email security settings and consider additional protections like multi-factor authentication.
5. Ask your IT provider
Has the patch for the Microsoft Outlook vulnerability CVE-2023-23397 been applied to all our systems, and are there any additional steps we should take to protect our organisation?
6. Bottom line
Make sure your Microsoft Outlook software is fully updated now to prevent attackers from exploiting this critical vulnerability.
Information based on CISA KEV, NVD and reputable security reporting.