CVE-2025-66118: Boldgrid Sprout Clients

High severity, CVSS 7.1. EPSS: 0.2% chance of exploitation in the next 30 days.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in BoldGrid Sprout Clients sprout-clients allows Reflected XSS.This issue affects Sprout Clients: from n/a through <= 3.2.1.

Affected products

• Boldgrid Sprout Clients: up to and including 3.2.1

Published 2025-12-18. Last modified 2026-06-17.