CVE-2026-40451
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
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| deepl | chrome_extension | From 1.22.0 (inc) to 1.23.0 (inc) |
Helpful Resources
Exploitability
| 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. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
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.
How can this vulnerability impact me? :
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.