CVE-2026-68800: Microsoft Excel Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
CSIRTS triage
- What
- Heap-based buffer overflow in Microsoft Office Excel allows local code execution.
- Who is affected
- Users opening untrusted Excel files locally.
- Urgency
- High severity (CVSS 7.8) with active exploitation potential; remediation is critical.
- Action
- Apply latest security patches for Microsoft Office 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-2026-68800
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-2026-688000.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 25% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-68800 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- high[NEW] [high] Microsoft Office Products: Multiple Vulnerabilitiescert-bund
- unknownMultiple vulnerabilities in Microsoft Office (August 12, 2026)cert-fr-avis
- unknownNCSC-2026-0286 [1.00] [M/H] Vulnerabilities patched in Microsoft Officencsc-nl
- highCVE-2026-68800: Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execut…nvd
Recent advisories for Microsoft Excel Remote
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- highCVE-2026-68811: Microsoft Excel Remote Code Execution Vulnerabilitymsrc · 2026-08-11
- highCVE-2026-68816: Microsoft Excel Remote Code Execution Vulnerabilitymsrc · 2026-08-11
- highCVE-2026-68810: Microsoft Excel Remote Code Execution Vulnerabilitymsrc · 2026-08-11
- highCVE-2026-68796: Microsoft Excel Remote Code Execution Vulnerabilitymsrc · 2026-08-11
- highCVE-2026-68794: Microsoft Excel Remote Code Execution Vulnerabilitymsrc · 2026-08-11
- highCVE-2026-65807: Microsoft Excel Remote Code Execution Vulnerabilitymsrc · 2026-08-11
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