Quick answers
- Is CVE-2026-123381 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-123381 being exploited in the wild.
- How severe is CVE-2026-123381?
- High severity, with a CVSS score of 8.8, published 10 November 2026.
- Which products and versions are affected?
- Microsoft Office Outlook.
- Is there a fix for CVE-2026-123381?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-123381 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-123381?
- Check whether you run Microsoft Office Outlook. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A stack-based buffer overflow exists in Microsoft Outlook that can be triggered via a network attack vector without requiring authentication or user interaction beyond receiving a malicious message. The vulnerability allows remote code execution with the privileges of the user running Outlook. The CVSS v3.1 score of 8.8 reflects high severity from network accessibility and significant impact on confidentiality, integrity, and availability.
Affected products
- Microsoft Office Outlook
Timeline
- 2026-11-10: disclosed