CVE-2023-1166: USM Premium < 16.3 - Admin+ Stored XSS

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-06-27 · updated 2026-06-17

Description

The USM-Premium WordPress plugin before 16.3 does not sanitize and escape some of its settings, which could allow high-privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example, in multisite setup).

Affected products

Ultimate-Premium-Plugin: before 16.3 — fixed in 16.3

How to fix

Upgrade to a fixed version: Ultimate-Premium-Plugin 16.3. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/825eccf9-f351-4a5b-b238-9969141b94fa
https://wpscan.com/vulnerability/825eccf9-f351-4a5b-b238-9969141b94fa

Get alerted when CVE-2023-1166 or the next vulnerability affects your stack