PatchTheCVECVE-2023-1166: The USM-Premium WordPress plugin before 16.3 does not sanitize and escape some of its settings, which could al
CVE-2023-1166 is a medium-severity flaw (CVSS 4.8) affecting usm premium. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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).
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 4.8 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | High |
| User interaction | Required |
| EPSS exploit chance | 0.5% (top 59%) |
| CISA exploited list | No |
| Published | 2023-06-27 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2023-1166?
usm premium: upgrade to 16.3. Exact commands for each OS are on this page.
Is CVE-2023-1166 being exploited?
CVE-2023-1166 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2023-1166 affect?
CVE-2023-1166 affects usm premium. Severity is medium (CVSS 4.8). 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
How urgent is CVE-2023-1166?
Priority 32/100. Public exploit reference