[NEW] [high] Microsoft Excel (2016), Office (2019, 2021 and 2024) and 365 Apps: Vulnerability allows code execution
A remote anonymous attacker can exploit a vulnerability in Microsoft Excel 2016, Microsoft Office 2024, Microsoft Office 2021, Microsoft 365 Apps Enterprise and Microsoft Office 2019 to execute arbitrary code.
CSIRTS triage
- What
- A remote attacker can execute arbitrary code in Microsoft Excel and Office products through an unauthenticated attack.
- Who is affected
- Organizations and users running Microsoft Excel 2016, Office 2019, 2021, 2024, and 365 Apps.
- Urgency
- Critical priority; unauthenticated remote code execution in widely-used productivity software requires emergency patching.
- Action
- Apply Microsoft security updates for Excel and Office products addressing CVE-2026-62870 immediately.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2625
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-2026-628700.63% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 48% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-62870 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
Recent advisories for Microsoft Excel
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.
- mediumCVE-2026-85875: Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose infor…nvd · 2026-09-08
- highCVE-2026-81960: Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execut…nvd · 2026-09-08
- highCVE-2026-81959: Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execut…nvd · 2026-09-08
- mediumCVE-2026-81958: Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to dis…nvd · 2026-09-08
- highCVE-2026-81957: Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code l…nvd · 2026-09-08
- highCVE-2026-81956: Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code l…nvd · 2026-09-08
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