CVE-2026-40451: Deepl Chrome Browser Extension

Medium severity, CVSS 5.1. EPSS: 0.3% chance of exploitation in the next 30 days.

DeepL Chrome browser extension versions from v1.22.0 to v.1.23.0 contain a cross-site scripting vulnerability, which allows an attacker to execute arbitrary script in a user's browser, and inject malicious HTML into web pages viewed by the user.

Affected products

• Deepl Chrome Browser Extension

Published 2026-04-22. Last modified 2026-06-17.