What is CVE-2025-64677?

CVE-2025-64677 is a high-severity vulnerability in Microsoft Office Out-Of-Box Experience, classified under Cross-site Scripting. CVSS score: 8.2/10. Published 2025-12-18.

How severe is CVE-2025-64677?

High severity. CVSS v3 base score is 8.2 out of 10.

XSS in Microsoft Office Out-Of-Box Experience

CVE-2025-64677

Improper neutralization of input during web page generation ('cross-site scripting') in Office Out-of-Box Experience allows an unauthorized attacker to perform spoofing over a network.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.005 (38.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.

Affected products

Microsoft Office Out-of-box Experience
Microsoft Office_out-of-box_experience

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

secure@microsoft.com (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2025-64677?: CVE-2025-64677 is a high-severity vulnerability in Microsoft Office Out-Of-Box Experience, classified under Cross-site Scripting. CVSS score: 8.2/10. Published 2025-12-18.
How severe is CVE-2025-64677?: High severity. CVSS v3 base score is 8.2 out of 10.