Microsoft Office SharePoint Spoofing VulnerabilityVendor advisorypatch
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70306 CVE-2026-70306
CRITICAL
Microsoft Office SharePoint Spoofing Vulnerability
Record summary
CVE-2026-70306 has a selected CVSS score of 9.3 (critical).
Description
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.
Description source: GitHub Advisory
Exploitation context
CISA SSVC decision
ExploitationNone
AutomatableNo
Technical impactTotal
CISA Coordinator · SSVC 2.0.3 · Evaluated Aug 11, 2026 · Source: CVE List
Affected products and versions
3| Product | Source | Version range | Status |
|---|---|---|---|
Microsoft SharePoint Enterprise Server 2016Browse Microsoft / Microsoft SharePoint Enterprise Server 2016 | CVE List | 16.0.0 to < 16.0.5561.1001 | affected |
Microsoft SharePoint Server 2019Browse Microsoft / Microsoft SharePoint Server 2019 | CVE List | 16.0.0 to < 16.0.10417.20175 | affected |
Microsoft SharePoint Server Subscription EditionBrowse Microsoft / Microsoft SharePoint Server Subscription Edition | CVE List | 16.0.0 to < 16.0.19725.20434 | affected |
References
2nvd.nist.gov
https://nvd.nist.gov/vuln/detail/CVE-2026-70306