Quick answers
- Is CVE-2026-120786 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-120786 being exploited in the wild.
- How severe is CVE-2026-120786?
- High severity, with a CVSS score of 8.8, published 10 November 2026.
- Which products and versions are affected?
- Microsoft Excel.
- Is there a fix for CVE-2026-120786?
- 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-2026-120786 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-120786?
- Check whether you run Microsoft Excel. 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 heap-based buffer overflow in Microsoft Excel's file parsing logic allows remote code execution via a specially crafted spreadsheet file. The vulnerability is triggered when Excel processes the malicious file, and no authentication is required. An attacker gains arbitrary code execution in the context of the user running Excel, though exploitation requires the user to open the malicious file.
Affected products
- Microsoft Excel
Timeline
- 2026-11-10: disclosed