Quick answers
- Is CVE-2026-123395 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-123395 being exploited in the wild.
- How severe is CVE-2026-123395?
- Medium severity, with a CVSS score of 5.9, published 10 November 2026.
- Which products and versions are affected?
- Microsoft Office Excel.
- Is there a fix for CVE-2026-123395?
- 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-2026-123395 attacked?
- It is attacked with local access, in a web application.
- Am I affected by CVE-2026-123395?
- 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 improper control of code generation flaw in Microsoft Office Excel permits code injection, allowing an authenticated attacker to execute arbitrary code within the Excel process context. The vulnerability requires user authorization to trigger, and successful exploitation results in local information disclosure without further privilege escalation.
Affected products
- Microsoft Office Excel
Timeline
- 2026-11-10: disclosed