CVE-2026-40451
Received Received - Intake
Cross-Site Scripting in DeepL Chrome Extension Enables Script Injection

Publication date: 2026-04-22

Last updated on: 2026-04-22

Assigner: JPCERT/CC

Description
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.
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Meta Information
Published
2026-04-22
Last Modified
2026-04-22
Generated
2026-06-16
AI Q&A
2026-04-22
EPSS Evaluated
2026-06-14
NVD
CVE-2026-40451
EUVD
EUVD-2026-24605
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
deepl chrome_extension From 1.22.0 (inc) to 1.23.0 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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Executive Summary

This vulnerability exists in the DeepL Chrome browser extension versions from v1.22.0 to v1.23.0. It is a cross-site scripting (XSS) vulnerability that allows an attacker to execute arbitrary scripts in a user's browser. Additionally, the attacker can inject malicious HTML into web pages viewed by the user.

Impact Analysis

The vulnerability can impact you by allowing attackers to run malicious scripts in your browser without your permission. This can lead to unauthorized actions such as stealing sensitive information, hijacking user sessions, or manipulating the content of web pages you visit.

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