Vulnerability details
CVE-2026-109454
Microsoft SharePoint Server
Microsoft Office SharePoint Spoofing Vulnerability
CVSS 3.1
9.0Critical
Remedy
Versions not listed as affected in the CVE record:
- Microsoft SharePoint Server Subscription Edition — version 16.0.20326.20278 and later
Official description
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.0Critical | 3.1 | CVEProject cvelistV5 (CNA) (microsoft) | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Microsoft | Microsoft SharePoint Server Subscription Edition | 16.0.0 ≤ v < 16.0.20326.20278 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109454 vendor-advisorypatch
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Details
- Published
- 2026-11-10
- Last updated
- 2026-11-11
- State
- Published
- Assigner (CNA)
- microsoft
- Kolun priority
- 38 · Medium
Exploit prediction (EPSS)
0.84%
Probability of exploitation in 30 days
58.3%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')