EUVD-2026-56703
GHSA-f6rm-3j6f-3r58
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Network-accessible stored XSS requiring low-privileged authenticated contributor access and active victim interaction, with scope change to victim browser context; no availability impact applies to this class of injection.
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 allows an authenticated attacker to inject malicious script content that executes within other users' browser sessions, enabling spoofing and potential session compromise. Affected are SharePoint Server Subscription Edition, 2019, and 2016 Enterprise editions running builds below the July 2026 cumulative update thresholds. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a valid SharePoint account with at minimum contributor-level permissions sufficient to create or edit content on a site accessible to the target victim - CVSS PR:L confirms authenticated access is required and anonymous exploitation is not possible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 5.4 Medium score reflects genuine but operationally constrained risk: the network attack vector and low complexity are significantly offset by the requirement for low-level authentication (PR:L) and mandatory victim interaction (UI:R), preventing fully automated mass exploitation. … 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 the vendor-released cumulative updates that resolve this vulnerability: SharePoint Server Subscription Edition must be updated to build 16.0.19725.20522 or later; SharePoint Server 2019 must be updated to build 16.0.10417.20198 or later; SharePoint Enterprise Server 2016 must be updated to build 16.0.5565.1001 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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