CVE-2026-70355

Microsoft SharePoint Server Elevation of Privilege Vulnerability

CVE-2026-70355 is fixed in 2 products on 1 platform, first by KB5002896, released August 11, 2026. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.

Urgent

CVSS

7.3

Important

Exploitation

More likely

Vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0078

56th percentile

<p>Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.</p>

Where it's fixed

Product	Fix	Released
Microsoft
Microsoft SharePoint Server 2019	KB5002896	Aug 11, 2026
Microsoft SharePoint Server 2019	KB5002894	Aug 11, 2026
Microsoft SharePoint Server Subscription Edition	KB5002893	Aug 11, 2026

Details

Published
August 11, 2026
Weakness
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70355

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