CVE-2026-20945
MediumCVSS 4.6Exploitation Probability (EPSS)
Very high risk97th percentile - higher than 97% of all known CVEs
Summary
Improper neutralization of input during web page generation (cross-site scripting) in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
Risk Assessment
An authorized attacker can perform XSS-based spoofing, potentially leading to data leakage or actions in the victim's context.
Recommendation
Apply Microsoft security updates for SharePoint and enforce input validation/sanitization.
Other vulnerabilities in Microsoft Office SharePoint
See all- 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.
- CVE-2026-55040CriticalActively exploited
A vulnerability in Microsoft Office SharePoint allows an unauthorized attacker to bypass a security feature over the network due to weak authentication.
- CVE-2026-58644CriticalActively exploited
A deserialization of untrusted data vulnerability in Microsoft Office SharePoint allows an unauthorized attacker to execute code remotely over a network.
- CVE-2026-56164MediumActively exploited
Missing authentication for a critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
- CVE-2026-50522CriticalActively exploited
Deserialization of untrusted data vulnerability in Microsoft Office SharePoint. An unauthenticated attacker can remotely execute code on the SharePoint server.
- CVE-2026-33112High
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Original NVD description (English source)
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS