CVE-2021-38359: WordPress InviteBox Plugin <= 1.4.1 Reflected Cross-Site Scripting

Severity: medium (CVSS 4.3 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-09-10 · updated 2026-06-17
Weakness: CWE-79

Description

The WordPress InviteBox Plugin for viral Refer-a-Friend Promotions WordPress plugin is vulnerable to Reflected Cross-Site Scripting via the message parameter found in the ~/admin/admin.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.4.1.

Affected products

WordPress InviteBox Plugin: through 1.4.1

References

https://plugins.trac.wordpress.org/browser/refer-a-friend-widget-for-wp/tags/1.4.1/admin/admin.php#L75
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-38359
https://plugins.trac.wordpress.org/browser/refer-a-friend-widget-for-wp/tags/1.4.1/admin/admin.php#L75
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-38359

Get alerted when CVE-2021-38359 or the next vulnerability affects your stack