Quick answers
- Is CVE-2026-124187 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-124187 being exploited in the wild.
- How severe is CVE-2026-124187?
- High severity, with a CVSS score of 8.8, published 10 November 2026.
- Which products and versions are affected?
- Microsoft Office Excel.
- Is there a fix for CVE-2026-124187?
- 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-2026-124187 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-124187?
- Check whether you run Microsoft Office 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 use-after-free memory safety flaw in Microsoft Office Excel enables remote code execution when processing specially crafted files. The vulnerability can be triggered over the network without requiring user authentication beyond opening a malicious Excel document, though user interaction (opening the file) is necessary for exploitation.
Affected products
- Microsoft Office Excel
Timeline
- 2026-11-10: disclosed