EUVD-2026-56425
GHSA-6jm6-j28j-pj6p
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Network-accessible XSS requiring authenticated low-privileged contributor access and active victim interaction; scope unchanged to SharePoint origin; no availability impact.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
Lifecycle Timeline
4DescriptionNVD
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.
AnalysisAI
Cross-site scripting in Microsoft SharePoint Server (2016, 2019, and Subscription Edition) enables an authenticated, low-privileged attacker to inject malicious script content that renders in a victim's browser upon interaction with a crafted page, enabling spoofing and potential session compromise. All three actively-supported on-premises SharePoint product lines are affected, with patched builds available via Microsoft's Security Response Center advisory. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold a valid SharePoint on-premises account with at minimum contributor-level access sufficient to create or modify pages or list items - the CVSS PR:L metric confirms this authentication prerequisite. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 4.6 (Medium) accurately reflects the constrained attack surface: PR:L requires the attacker to already hold valid SharePoint credentials, UI:R gates exploitation on victim interaction, and S:U limits blast radius to the SharePoint origin - three conditions that collectively compress real-world risk well below what a network-vector score might suggest in isolation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The definitive fix is to apply Microsoft's cumulative updates: upgrade SharePoint Enterprise Server 2016 to build 16.0.5565.1001 or later, SharePoint Server 2019 to build 16.0.10417.20198 or later, and SharePoint Server Subscription Edition to build 16.0.19725.20522 or later, all available via the Microsoft Security Response Center at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64922. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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