Vulnerability in Microsoft Office (August 3, 2026)

unknownCVE-2026-62870

A vulnerability has been discovered in Microsoft Office. It allows an attacker to cause remote arbitrary code execution.

CSIRTS triage

vendor: Microsoft product: Office Remote code execution

What: Microsoft Office contains a vulnerability allowing remote arbitrary code execution.
Who is affected: All Microsoft Office users and deployments are potentially affected.
Urgency: Critical; remote code execution without user privilege escalation is immediately exploitable.
Action: Apply Microsoft Office security updates from August 3, 2026 immediately.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-FR Avis de sécurité (FR · national-cert · site)
Severity: unknown
Published: 2026-08-03
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0961/

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-2026-628700.84% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 54% 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 Office

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.

high[NEW] [high] Microsoft Office: Multiple vulnerabilitiescert-bund · 2026-08-07
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criticalCVE-2026-70332: Microsoft Office SharePoint Spoofing Vulnerabilitymsrc · 2026-08-06
high[NEW] [high] Microsoft Excel (2016), Office (2019, 2021 and 2024) and 365 Apps: Vulnerability allows code exec…cert-bund · 2026-08-04
highCVE-2026-62870: Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over …nvd · 2026-08-04
critical[NEW] [critical] Microsoft Office products: Multiple vulnerabilitiescert-bund · 2026-07-23