CVE-2026-64904: Microsoft Office Remote Code Execution Vulnerability
Access of resource using incompatible type ('type confusion') in Microsoft Office allows an unauthorized attacker to execute code locally.
CSIRTS triage
- What
- Type confusion vulnerability in Microsoft Office allows unauthorized remote code execution.
- Who is affected
- Users opening untrusted Office documents.
- Urgency
- High severity; RCE via type confusion is easily exploitable and impacts all Office users.
- Action
- Apply the latest Microsoft Office security update immediately.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64904
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-649040.30% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 23% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-64904 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
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