Vulnerability · Published Apr 22, 2026 · Assigned by jpcert
CVE-2026-40451
Medium 6.1
In plain English
A medium-severity cross-site scripting in Chrome browser extension from DeepL. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% of all known vulnerabilities).
Severity (CVSS 3.0)6.1Medium
Exploit odds (30 days)0.2%top 93.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| DeepL | Chrome browser extension | from v1.22.0 to v.1.23.0 |
Weakness: CWE-79 · Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N