CVE-2026-65660KEV · OVERDUECWE-94code-injection

Microsoft SharePoint Code Injection Vulnerability

High · published August 11, 2026

Patch now

Confirmed exploited, and the score agrees

CVSS calls it high at 8.8. It is confirmed in active exploitation. It sits in the 81.6th percentile for exploit probability.

25
days past CISA
deadline
CVSS v3.1
8.8
EPSS
2%
Percentile
81.6
In the wild
Confirmed
What it is

Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.02101 · 81.6th percentile
Weakness
CWE-94 · Improper Control of Generation of Code ('Code Injection')
Published
2026-08-11T21:18Z
KEV added
2026-09-25 · due 2026-09-28
Affected products (3)
ProductVersionsFixed in
microsoft/sharepoint_server< 16.0.19725.2052216.0.19725.20522
microsoft/sharepoint_serverall versions—
microsoft/sharepoint_serverall versions—
References (3)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660 · [email protected]https://blog.previdian.com/cve-2026-65660-previdian-observes-two-stage-sharepoint-exploitation-attempts/ · 134c704f-9b21-4f2e-91b3-4a467353bcc0https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-65660 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 11 AUG 17:04Z
    Microsoft SharePoint Server Spoofing Vulnerability
    cvelistv5