# CVE-2026-55030: Microsoft SharePoint Server Spoofing Vulnerability

CVE-2026-55030 is fixed in 3 products on 1 platform, first by KB5002891, released July 14, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-55030
- Priority: Routine
- CVSS: 4.6 (Important)
- EPSS: 0.0058
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: N/A
- Published: Jul 14, 2026
- Weakness: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55030

## Description

<p>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.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft SharePoint Enterprise Server 2016 |  | [KB5002891](https://patchblox.com/security/data/fix/microsoft/kb5002891.md) | Jul 14, 2026 |
| Microsoft | Microsoft SharePoint Server 2019 |  | [KB5002883](https://patchblox.com/security/data/fix/microsoft/kb5002883.md) | Jul 14, 2026 |
| Microsoft | Microsoft SharePoint Server Subscription Edition |  | [KB5002882](https://patchblox.com/security/data/fix/microsoft/kb5002882.md) | Jul 14, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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