Quick answers
- Is CVE-2026-100208 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-100208 being exploited in the wild.
- How severe is CVE-2026-100208?
- High severity, with a CVSS score of 7.5, published 25 September 2026.
- Which products and versions are affected?
- Microsoft Office Outlook.
- Is there a fix for CVE-2026-100208?
- 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-2026-100208 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-100208?
- 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
An integer overflow or wraparound condition in Microsoft Office Outlook permits remote code execution via network-based attack vectors. The vulnerability requires no authentication or user interaction beyond opening a message, and successful exploitation grants the attacker code execution in the context of the Outlook process. A patch is available from Microsoft.
Affected products
- Microsoft Office Outlook
Timeline
- 2026-09-25: disclosed