CVE-2021-34817: Etherpad

Medium severity, CVSS 6.1. EPSS: 1.3% chance of exploitation in the next 30 days.

A Cross-Site Scripting (XSS) issue in the chat component of Etherpad 1.8.13 allows remote attackers to inject arbitrary JavaScript or HTML by importing a crafted pad.

Affected products

• Etherpad Etherpad: version 1.8.13 only

Published 2021-07-19. Last modified 2026-06-17.