CVE-2026-44823: Microsoft Excel Remote Code Execution Vulnerability
Numeric truncation error in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
CSIRTS triage
- What
- Integer underflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
- Who is affected
- Users of Microsoft Excel.
- Urgency
- Remediation is urgent due to the high severity and potential for remote code execution.
- Action
- Install the latest security updates for Microsoft Excel.
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-2026-44823
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-2026-448230.37% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-44823 | coverage & exploitation status | NVD · CVE.org |
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