Async JavaScript <= 2.19.07.14 - Authenticated (Subscriber+) Stored Cross-Site Scripting

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE CVE-2020-36854
CVSS Medium (6.4)
Publicly Published February 27, 2020
Last Updated October 18, 2025
Researcher Mikey Veenstra
Description

The Async JavaScript plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 2.19.07.14. This is due to missing authorization checks on the aj_steps AJAX aciton along with a lack on sanitization on the settings saved via the function. This makes it possible for authenticated attackers with subscriber level permissions and above to inject malicious web scripts into a page that execute whenever a user accesses that page.

References

1 affected software package

Software Type Plugin
Software Slug async-javascript (view on wordpress.org)
Patched? Yes
Affected Version
  • <= 2.20.02.27
Patched Version
  • 2.20.02.27
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