EUVD-2026-56602
GHSA-wcw7-qcg8-fr2j
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Attacker requires a valid account (PR:L), victim interaction is mandatory (UI:R), and scope change applies because script executes in victim's browser session with elevated context; no availability impact is described.
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
6DescriptionNVD
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Privilege escalation via stored cross-site scripting in Microsoft SharePoint Server allows an authenticated low-privileged attacker to elevate their rights over a network by injecting malicious script that executes in a victim's browser session. Affected products include SharePoint Server 2019 and Subscription Edition with specific unpatched builds. …
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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 submit or edit content on the affected instance (PR:L in CVSS). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Despite a CVSS base score of 8.7, real-world risk is moderated by several factors. … 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 primary fix is to apply the vendor-released cumulative update that addresses this vulnerability. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all deployed SharePoint Server 2019 and Subscription Edition instances and document their current build versions against the vendor advisory to determine which systems are affected. …
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Threat intelligence, references, and detailed analysis are available after sign-in.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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