PatchTheCVECVE-2026-64918: Insufficiently protected credentials in Microsoft Office allows an unauthorized attacker to perform spoofing o
CVE-2026-64918 is a medium-severity flaw (CVSS 6.5) affecting 365 apps, office 2016, office 2019. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Insufficiently protected credentials in Microsoft Office allows an unauthorized attacker to perform spoofing over a network.
Why this priority
- On your watchlist
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 6.5 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.9% (top 41%) |
| CISA exploited list | No |
| Weakness | CWE-522 |
| Published | 2026-09-08 |
| Last modified | 2026-09-09 |
Last updated 2026-09-09 · 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
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-2026-64918?
365 apps: mitigate or apply the listed mitigation; office 2016: mitigate or apply the listed mitigation; office 2019: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2026-64918 being exploited?
CVE-2026-64918 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-2026-64918 affect?
CVE-2026-64918 affects 365 apps, office 2016, office 2019. Severity is medium (CVSS 6.5). Insufficiently protected credentials in Microsoft Office allows an unauthorized attacker to perform spoofing over a network.
How urgent is CVE-2026-64918?
Priority 42/100. On your watchlist
Software pages
Microsoft Office vulnerabilities
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