PatchTheCVECVE-2026-70125: Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code locally
CVE-2026-70125 is a high-severity flaw (CVSS 7.8) affecting 365 apps, office 2021, office 2024. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code locally.
Why this priority
- High severity
- On your watchlist
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 7.8 (High) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.3% (top 75%) |
| CISA exploited list | No |
| Weakness | CWE-122 |
| Published | 2026-09-23 |
| Last modified | 2026-10-30 |
Last updated 2026-10-30 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Advisories and coverage
Official advisories
- Microsoft MSRC Update Guide: CVE-2026-70125 Microsoft Office Outlook Remote Code Execution Vulnerability 2026-10-30
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-70125?
365 apps: mitigate or apply the listed mitigation; office 2021: mitigate or apply the listed mitigation; office 2024: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2026-70125 being exploited?
CVE-2026-70125 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-70125 affect?
CVE-2026-70125 affects 365 apps, office 2021, office 2024. Severity is high (CVSS 7.8). Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code locally.
How urgent is CVE-2026-70125?
Priority 39/100. High severity; On your watchlist
Software pages
Microsoft Office vulnerabilities · Outlook vulnerabilities
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