Quick answers
- Is CVE-2026-123394 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-123394 being exploited in the wild.
- How severe is CVE-2026-123394?
- High severity, with a CVSS score of 8.8, published 10 November 2026.
- Which products and versions are affected?
- Microsoft Office Word.
- Is there a fix for CVE-2026-123394?
- 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-2026-123394 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-123394?
- Check whether you run Microsoft Office Word. 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 Word's document parsing, allowing remote code execution when a specially crafted file is opened. The vulnerability is exploitable over the network without authentication, though it requires user interaction to open the malicious document. Successful exploitation grants the attacker code execution in the context of the Word process.
Affected products
- Microsoft Office Word
Timeline
- 2026-11-10: disclosed