CVE-2026-58651: Microsoft Word Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code locally.
CSIRTS triage
- What
- Heap-based buffer overflow in Microsoft Word enables unauthorized remote code execution.
- Who is affected
- Users opening untrusted Word documents.
- Urgency
- High severity; not currently exploited in the wild but buffer overflows are easily weaponizable.
- Action
- Apply the latest Microsoft Office security update from Windows Update or Microsoft's patch portal.
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-2026-58651
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-2026-586510.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 32% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-58651 | 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 Word 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-2026-64905: Microsoft Office Word Remote Code Execution Vulnerabilitymsrc · 2026-08-11
- highCVE-2026-63518: Microsoft Office Word Remote Code Execution Vulnerabilitymsrc · 2026-08-11
- highCVE-2026-64907: Microsoft Office Word Remote Code Execution Vulnerabilitymsrc · 2026-08-11
- highCVE-2026-63525: Microsoft Office Word Remote Code Execution Vulnerabilitymsrc · 2026-08-11
- highCVE-2026-64915: Microsoft Office Word Remote Code Execution Vulnerabilitymsrc · 2026-08-11
- highCVE-2026-63527: Microsoft Office Word Remote Code Execution Vulnerabilitymsrc · 2026-08-11
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