Cross-site scripting in OSD Subscribe - CVE-2021-38351

Description

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 "osd_subscribe_message" parameter in the ~/options/osd_subscribe_options_subscribers.php file. A remote attacker can trick the victim to follow a specially crafted link 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.

Remediation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

External links

• https://plugins.trac.wordpress.org/browser/osd-subscribe/tags/1.2.3/options/osd_subscribe_options_subscribers.php#L86
• https://www.wordfence.com/vulnerability-advisories/#CVE-2021-38351