CVE-2021-38351: Outsidesource Osd Subscribe

Medium severity, CVSS 6.1. EPSS: 0.9% chance of exploitation in the next 30 days.

The OSD Subscribe WordPress plugin is vulnerable to Reflected Cross-Site Scripting via the osd_subscribe_message parameter found in the ~/options/osd_subscribe_options_subscribers.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.2.3.

Affected products

• Outsidesource Osd Subscribe: up to and including 1.2.3

Published 2021-09-10. Last modified 2026-06-17.