Quick answers
- Is CVE-2026-124179 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-124179 being exploited in the wild.
- How severe is CVE-2026-124179?
- 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-2026-124179?
- 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-2026-124179 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-124179?
- 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 vulnerability in Microsoft Office Excel permits reading memory beyond allocated buffer boundaries. The vulnerability is triggered when Excel processes a malformed spreadsheet, allowing a network-based attacker to craft a file that leaks sensitive data during parsing. Exploitation requires user interaction to open the malicious file but grants information disclosure without code execution.
Affected products
- Microsoft Office Excel
Timeline
- 2026-11-10: disclosed