EUVD-2026-56765
GHSA-2x3w-6746-j849
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Unauthenticated network XSS needing victim interaction (UI:R) with browser-context scope change (S:C); impact assessed Low as the stated effect is spoofing, not full data compromise.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
AnalysisAI
Cross-site scripting in Microsoft Office SharePoint lets a remote, unauthenticated attacker inject script that executes in a victim's browser session to conduct spoofing, provided the victim is lured into interacting with the malicious content. Microsoft rates it 9.3 (Critical) with a scope-changed vector, reflecting that injected script escapes into the victim's authenticated SharePoint context. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires victim user interaction (CVSS UI:R): the target must open or interact with attacker-supplied SharePoint content or a crafted link for the injected script to execute - it is not a zero-click bug. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are mixed and warrant a nuanced read rather than a raw 9.3-driven panic. … 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 Microsoft security update for CVE-2026-70306; patch available per vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70306 - the exact fixed build was not included in this intelligence, so pull the specific KB/version for your SharePoint edition from the MSRC update guide. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Issue organization-wide security alert describing the SharePoint XSS risk and instructing users to avoid clicking untrusted links within SharePoint and to report suspicious activity; enable content security monitoring on mail gateways to flag malicious patterns. …
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External POC / Exploit Code
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