What’s Vulnerable › Vulnerabilities

CVE-2025-55243: Microsoft OfficePlus Spoofing Vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-09 · updated 2026-06-17
• Weakness: CWE-200

Description

Exposure of sensitive information to an unauthorized actor in Microsoft Office Plus allows an unauthorized attacker to perform spoofing over a network.

Affected products

• Microsoft OfficePLUS: before 3.10.0.26585 — fixed in 3.10.0.26585
• Microsoft OfficePLUS: from 3.0.0.0 before 3.10.0.26585 — fixed in 3.10.0.26585

How to fix

Upgrade to a fixed version: Microsoft OfficePLUS 3.10.0.26585; Microsoft OfficePLUS 3.10.0.26585. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55243

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