CVE-2025-4595: Jtewes Fastspring

Medium severity, CVSS 6.4. EPSS: 0.2% chance of exploitation in the next 30 days.

The FastSpring plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'fastspring/block-fastspringblocks-complete-product-catalog' block in all versions up to, and including, 3.0.1 due to insufficient input sanitization and output escaping on the 'color' attribute. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Affected products

• Jtewes Fastspring: up to and including 3.0.1

Published 2025-05-31. Last modified 2026-06-17.