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Microsoft Office SharePoint

CVE-2026-70355 — Microsoft SharePoint Server Elevation of Privilege Vulnerability

Important CVSS 8.7 EPSS 0.00418 2026-08 archive

Executive Summary

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.

Overview

8.7
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
More Likely
MS Exploit Likelihood
Category Elevation of Privilege
Released Aug 11 2026
Last Updated Aug 11 2026
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.00418 — 0.34736 percentile
NVD CVSS 8.7 HIGH — differs from MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
Required
SCOPE
Changed
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
None
Temporal Score: 7.3

EPSS Score

0.00418
probability of exploitation in the next 30 days
0.34736 percentile - updated 2026-08-14
View on FIRST.org

Affected Products

1 affected product
Product KB Article Severity Impact Restart Required
Microsoft SharePoint Server 2019 5002894 (Security Update) 5002896 (Security Update) Important Elevation of Privilege Base: 7.3 Temporal: 7.3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N 16.0.10417.20198 Maybe None Microsoft SharePoint Server Subscription Edition 5002893 (Security Update) Important Elevation of Privilege Maybe

Patches

1 patch
Article Type Restart
5002893 Security Update Maybe

Known Exploits

On This Page