CVE-2026-55020Important
Microsoft SharePoint Server Spoofing Vulnerability
Assessment
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.
- Severity
- Important
- CVSS base score
- 4.6CVSS:3.1/
AV:N/ AC:L/ PR:L/ UI:R/ S:U/ C:L/ I:L/ A:N/ E:U/ RL:O/ RC:C - Impact
- Spoofing
- EPSS, next 30 days
- 0.6%Higher than 45.7% of scored CVEs · FIRST model run 26 Sep 2026 · about EPSS
- Exploitability
- Exploitation Unlikely
- Publicly disclosed
- No
- Customer action
- Required: apply the update
- Component
- Microsoft Office SharePoint
- Weakness
- CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- Issued by
- Microsoft
- Published
- 14 Jul 2026 · July 2026
- Last revised
- 14 Jul 2026
Updates that fix it
3 KBs| KB | Type | Restart | Applies to | Other CVEs |
|---|---|---|---|---|
| KB5002882 | Security Update | — | Microsoft SharePoint Server Subscription Edition | All CVEs in KB5002882 |
| KB5002883 | Security Update | — | Microsoft SharePoint Server 2019 | All CVEs in KB5002883 |
| KB5002891 | Security Update | — | Microsoft SharePoint Enterprise Server 2016 | All CVEs in KB5002891 |
Affected products
Microsoft Office3 affected products
- Microsoft SharePoint Enterprise Server 2016
- Microsoft SharePoint Server 2019
- Microsoft SharePoint Server Subscription Edition