CVE-2025-4595: FastSpring <= 3.0.1 - Authenticated (Contributor+) Stored Cross-Site Scripting
Description
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.
Classification
CVE ID: CVE-2025-4595
CVSS Base Severity: MEDIUM
CVSS Base Score: 6.4
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Problem Types
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Affected Products
Vendor: jtewes
Product: FastSpring
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.03% (probability of being exploited)
EPSS Percentile: 6.51% (scored less or equal to compared to others)
EPSS Date: 2025-06-01 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-4595https://www.wordfence.com/threat-intel/vulnerabilities/id/e96d118a-e38c-4043-9550-5f5ab0d83dc7?source=cve
https://wordpress.org/plugins/fastspring/