Remote code execution in Microsoft Word affects the widely used Office suite and can lead to full system compromise; merits broad IT notification.
CVE-2026-70302
Heap overflow in Microsoft Word enabling remote code execution.
Is CVE-2026-70302 being exploited?
Not confirmed. CVE-2026-70302 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.80% probability of exploitation in the next 30 days.
How severe is CVE-2026-70302?
CVE-2026-70302 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-70302?
Yes. A fix has been recorded for CVE-2026-70302. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-70302 affect?
CVE-2026-70302 affects Microsoft Word, Microsoft Office (Windows). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-70302?
Apply Microsoft security update immediately; block/untrusted Word docs and scan email attachments.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via crafted Word document over network; attacker can run arbitrary code and gain system-level control.
Immediate action required
- affected>= 16.0.1 and < https://aka.ms/OfficeSecurityReleases
- affected>= 1.0.0 and < publication
- affected>= 16.0.1 and < 16.0.14334.20974
- affected>= 16.0.0 and < 16.0.17932.21056
- affected>= 16.0.1 and < publication
- affected>= 16.0.0 and < publication
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.