EUVD-2026-56718
GHSA-6vgj-387w-6mj7
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Low-privilege authentication and active victim interaction are required; confidentiality and integrity impact is limited to SharePoint session context with no scope change or 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 Enterprise Server 2016, SharePoint Server 2019, and SharePoint Server Subscription Edition enables an authenticated low-privilege attacker to inject malicious script that, when rendered by a victim's browser, performs network-based spoofing within the SharePoint web application. All three current on-premises SharePoint product lines are affected across the 16.0.x branch, with specific fixed builds identified by EUVD-2026-56718. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to possess a valid low-privileged SharePoint account with at minimum contributor-level access to a site collection, as confirmed by the CVSS PR:L metric - anonymous or unauthenticated access is insufficient. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 4.6 (Medium) accurately reflects the meaningful prerequisites constraining this vulnerability: the attacker must hold a valid SharePoint account (PR:L) and a victim must actively render the malicious content in their browser (UI:R), substantially narrowing the exploitable population relative to a fully unauthenticated, no-interaction flaw. … 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 | Patch available per vendor advisory. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
More in Sharepoint Server
View allMicrosoft SharePoint Server contains a deserialization vulnerability allowing unauthenticated remote code execution over
Microsoft Office SharePoint contains a code injection vulnerability (CVE-2025-49704, CVSS 8.8) enabling authenticated at
Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a networ
Microsoft Word Remote Code Execution Vulnerability. Rated critical severity (CVSS 9.8), this vulnerability is remotely e
Microsoft SharePoint Server 2007 SP3, 2010 SP1 and SP2, and 2013; Office Web Apps 2010; Excel 2003 SP3, 2007 SP3, 2010 S
Microsoft Word 2007 SP3, Office 2010 SP2, Word 2010 SP2, Word 2013 SP1, Word 2013 RT SP1, Office for Mac 2011, Office fo
Microsoft Word 2007 SP3, Office 2010 SP2, Word 2010 SP2, Word Automation Services in SharePoint Server 2010, Web Applica
The default configuration of Microsoft SharePoint Portal Server 2003 SP3, SharePoint Server 2007 SP3 and 2010 SP1 and SP
Microsoft XML Core Services (aka MSXML) 3.0, 5.0, and 6.0 does not properly parse XML content, which allows remote attac
Microsoft Excel 2007 SP3, 2010 SP1 and SP2, 2013, and 2013 RT; Office 2007 SP3, 2010 SP1 and SP2, 2013, and 2013 RT; Off
Microsoft Word Automation Services in SharePoint Server 2010 SP1, Word Web App 2010 SP1 in Office Web Apps 2010, Word 20
Microsoft Word Automation Services in SharePoint Server 2010 SP1 and SP2, Word Web App 2010 SP1 and SP2 in Office Web Ap
Same weakness CWE-79 – Cross-site Scripting (XSS)
View allShare
External POC / Exploit Code
Leaving vuln.today