USM Premium <= 16.2 — Authenticated(Administrator+) Stored Cross-Site Scripting
CVE-2023-1166Published · Updated Action summary
Affected: ≤16.2Update to 16.3 or newer
All remediation stepsOn this page3
Overview
- Advisory ID
- CVE-2023-1166
- Product
- USM Premium Ultimate-Premium-Plugin
- Affected
- ≤16.2
- Fixed in
- 16.3
- Weakness
- CWE-79 Cross-Site Scripting
- Required access
- Admin account required
- Published
- · updated
- Credit
- Mohamed Selim
- Source
- Wordfence Intelligence
- Affected≤ 16.2
- Patched in16.3
Update to 16.3 or newer.
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:HAttack complexity- High
PR:HPrivileges required- High
UI:NUser interaction- None
S:CScope- Changed
C:LConfidentiality- Low
I:LIntegrity- Low
A:NAvailability- None
The USM Premium plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in versions up to, and including, 16.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
This only affects multi-site installations and installations where unfiltered_html has been disabled.
Not sure which version you run? Run a passive check — it reads public files only.
Remediation & mitigations
- Update to version 16.3, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
References & provenance
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Timeline
CVE published
Severity medium, CVSS 4.4
Record last updated
Sources & licenses
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.