Quick answers
- Is CVE-2026-118728 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-118728 being exploited in the wild.
- How severe is CVE-2026-118728?
- 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-2026-118728?
- 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-2026-118728 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-118728?
- 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's parsing logic allows an unauthenticated attacker to read memory beyond allocated buffer boundaries when processing a malformed file. The vulnerability can be triggered over the network when a user opens a crafted Excel document, leading to information disclosure. No authentication or user interaction beyond opening the file is required to trigger the leak.
Affected products
- Microsoft Office Excel
Timeline
- 2026-11-10: disclosed