CVE-2026-40451

State: Published
Severity: 5.1 Medium
Published: Apr 22, 2026
Updated: Apr 22, 2026
Reserved: Apr 13, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	5.1 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N	jpcert
3.0	6.1 Medium	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N	jpcert

Weaknesses

CWE-79 Cross-site scripting (XSS)

Affected Products

Product	Versions
Chrome browser extensionDeepL	from v1.22.0 to v.1.23.0Affected

References

https://github.com/DeepLcom/deepl-chrome-extension/security/advisories/GHSA-4x2r-q3p9-xhx4
https://jvn.jp/en/jp/JVN37524771/

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