Quick answers
- Is CVE-2026-102857 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-102857 being exploited in the wild.
- How severe is CVE-2026-102857?
- High severity, with a CVSS score of 8.8, published 13 October 2026.
- Which products and versions are affected?
- Microsoft Office Visio.
- Is there a fix for CVE-2026-102857?
- 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-2026-102857 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-102857?
- Check whether you run Microsoft 365 Apps, Microsoft Office 2021, Microsoft Office 2024 or one of the others listed. 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
A heap-based buffer overflow exists in Microsoft Office Visio that can be triggered remotely to execute arbitrary code. The vulnerability allows an attacker to exploit memory safety issues in the application's heap management. The attack vector is network-based, requiring no user authentication, though successful exploitation may depend on user interaction such as opening a malicious file.
Affected products
- Microsoft Office Visio
Timeline
- 2026-10-13: disclosed