What’s Vulnerable › Vulnerabilities

CVE-2025-64677: Office Out-of-Box Experience Spoofing Vulnerability

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-18 · updated 2026-10-01
• Weakness: CWE-79

Description

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.

Affected products

• Microsoft Office Out-of-Box Experience: all versions
• Microsoft Office Out-of-Box Experience: all versions

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-64677

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