What is CVE-2026-69690?

CVE-2026-69690 is a medium-severity vulnerability in Microsoft Sharepoint Server Subscription Edition, classified under Cross-site Scripting. CVSS score: 4.6/10. Published 2026-09-08.

How severe is CVE-2026-69690?

Medium severity. CVSS v3 base score is 4.6 out of 10.

XSS in Microsoft Sharepoint Server Subscription Edition

CVE-2026-69690

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-09-08 · last modified 2026-09-09.

CVSS v3 metric

CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (33.2th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Microsoft Office SharePoint Spoofing Vulnerability (vendor-advisory, Patch, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-69690?: CVE-2026-69690 is a medium-severity vulnerability in Microsoft Sharepoint Server Subscription Edition, classified under Cross-site Scripting. CVSS score: 4.6/10. Published 2026-09-08.
How severe is CVE-2026-69690?: Medium severity. CVSS v3 base score is 4.6 out of 10.