Quick answers
- Is CVE-2026-45469 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-45469 being exploited in the wild.
- How severe is CVE-2026-45469?
- High severity, with a CVSS score of 7.8, published 9 June 2026.
- Which products and versions are affected?
- Microsoft Excel.
- Is there a fix for CVE-2026-45469?
- 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-2026-45469 attacked?
- It is attacked with local access, in a network appliance.
- Am I affected by CVE-2026-45469?
- Check whether you run Microsoft 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 integer underflow (CWE-191) and subsequent heap-based buffer overflow (CWE-122) exist in Microsoft Office Excel. The vulnerability is triggered when the application processes a specially crafted file, leading to memory corruption. While the attack vector is classified as local, it typically requires user interaction (UI:R), such as a user opening a malicious document received via email or downloaded from the web. Successful exploitation allows for arbitrary code execution in the context of the current user. Microsoft has released security updates to address this issue.
Affected products
- Microsoft Excel
Timeline
- 2026-06-09: disclosed
- 2026-06-09: advisory