CVE-2025-54897
HighCVSS 8.8Exploitation Probability (EPSS)
Very high risk98th percentile - higher than 98% of all known CVEs
Summary
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network. The vulnerability arises from unsafe processing of serialized objects.
Risk Assessment
An attacker with valid credentials could execute arbitrary code in the context of the SharePoint server, potentially leading to system compromise and data access. The risk is high in environments with network access to SharePoint.
Recommendation
Apply the latest Microsoft security updates for SharePoint. Restrict network access to essential users and monitor for suspicious activity.
Other vulnerabilities in Microsoft Office SharePoint
See all- CVE-2026-40368High
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
- CVE-2026-40357High
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
- CVE-2026-35439High
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
- CVE-2026-33112High
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
- CVE-2026-33110High
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
- CVE-2026-20951High
Improper input validation in Microsoft Office SharePoint allows an unauthorized attacker to execute code locally.
- CVE-2026-20947High
Improper neutralization of special elements used in an sql command ('sql injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
- CVE-2026-70306Critical
A cross-site scripting vulnerability in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
- CVE-2026-65660HighActively exploited
Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
- CVE-2026-70332Critical
Improper input neutralization during web page generation (cross-site scripting) in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
Original NVD description (English source)
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS