Stored cross-site scripting in Async JavaScript plugin for WordPress

Published: 2020-02-28
Risk Medium
Patch available YES
Number of vulnerabilities 1
Exploitation vector Network
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software
Async JavaScript
Web applications / Modules and components for CMS

Vendor Frank Goossens (futtta)

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Stored cross-site scripting

EUVDB-ID: #VU25677

Risk: Medium



CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No


The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in the "wp-admin/admin-ajax.php" file with the "aj_steps" AJAX action. A remote authenticated attacker can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Note: the vulnerability is being actively exploited in the wild.


Install updates from vendor's website.

Vulnerable software versions

Async JavaScript: -

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?