Quick answers
- Is CVE-2026-124178 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-124178 being exploited in the wild.
- How severe is CVE-2026-124178?
- Medium severity, with a CVSS score of 6.5, published 10 November 2026.
- Which products and versions are affected?
- Microsoft Office Excel.
- Is there a fix for CVE-2026-124178?
- 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-2026-124178 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-124178?
- 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
An out-of-bounds read in Microsoft Office Excel permits information disclosure when processing specially crafted Excel files. The vulnerability can be triggered over the network and results in the exposure of memory contents that may contain sensitive data; no user interaction or authentication is required beyond opening a malicious file.
Affected products
- Microsoft Office Excel
Timeline
- 2026-11-10: disclosed