EUVD-2026-56702
GHSA-xhf5-7q52-p6j3
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Network-delivered XSS requiring authenticated low-privilege access and active victim interaction; high C/I impact within SharePoint's unchanged security scope with no availability impact.
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
5DescriptionNVD
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) allows an authenticated, low-privilege attacker to inject malicious scripts that execute in other users' browsers upon interaction, enabling session hijacking and spoofing attacks within the SharePoint context. The CVSS 7.3 score reflects high confidentiality and integrity impact bounded to the SharePoint application scope, gated by both valid credentials and victim interaction. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold at least a low-privilege authenticated account on the target SharePoint environment (PR:L per vendor CVSS vector) - unauthenticated exploitation is not supported. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.3 score is driven primarily by network accessibility (AV:N), low attack complexity (AC:L), and high confidentiality and integrity impacts (C:H/I:H/A:N), but the exploitation gate is meaningfully narrowed by the requirement for low-privilege authentication (PR:L) and mandatory victim user interaction (UI:R). … 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 | Apply Microsoft's released patches immediately: upgrade SharePoint Server 2019 to version 16.0.10417.20198 or later, SharePoint Enterprise Server 2016 to version 16.0.5565.1001 or later, and SharePoint Server Subscription Edition to version 16.0.19725.20522 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, catalog all SharePoint Server deployments and their current patch status, prioritizing Subscription Edition instances. …
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External POC / Exploit Code
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