CVE-2021-3734: Yourls

High severity, CVSS 8.8. EPSS: 0.4% chance of exploitation in the next 30 days.

yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames

Affected products

• Yourls Yourls: up to and including 1.8.1

Published 2021-08-26. Last modified 2026-06-17.