CVE-2021-38157: Leostream Connection Broker

Medium severity, CVSS 6.1. EPSS: 1.1% chance of exploitation in the next 30 days.

LeoStream Connection Broker 9.x before 9.0.34.3 allows Unauthenticated Reflected XSS via the /index.pl user parameter. NOTE: This vulnerability only affects products that are no longer supported by the maintainer

Affected products

• Leostream Connection Broker: from 9.0.3, before 9.0.34.3 (fixed in 9.0.34.3)

Published 2021-08-06. Last modified 2026-06-17.