by Kastro
Paper/Archive/CVE-2026-109454

CVE-2026-109454

Microsoft Microsoft SharePoint Server Subscription Edition — Microsoft Office SharePoint Spoofing Vulnerability

CVSS 9.0
critical.is priorityof 100
27
CVSS 9.0 (CNA)9.0 / 10 × 3027.0Not in CISA KEV+300.0No EPSS score.000 × 200.0No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Microsoft SharePoint Server Subscription Edition16.0.0 – < 16.0.20326.2027816.0.20326.20278CNA

Scores by source

microsoft (CNA)9.0CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

patchmsrc.microsoft.com/update-guide/vulnerability/CVE-2026-109454