PT-2026-34249 · Deepl · Deepl Chrome Browser Extension

Published 2026-04-22 · Updated 2026-04-28 · CVE-2026-40451

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions DeepL Chrome browser extension versions 1.22.0 through 1.23.0

Description A cross-site scripting flaw allows an attacker to execute arbitrary script in a user's browser and inject malicious HTML into web pages viewed by the user.

Recommendations Update DeepL Chrome browser extension versions 1.22.0 through 1.23.0 to a newer version.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-40451

Affected Products

Deepl Chrome Browser Extension

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-40451 · Security Note
• https://jvn.jp/en/jp/JVN37524771 · Note
• https://twitter.com/cybrsecpath/status/2048973616868643309 · Twitter Post
• https://github.com/DeepLcom/deepl-chrome-extension/security/advisories/GHSA-4x2r-q3p9-xhx4 · Note
• https://twitter.com/CVEnew/status/2047428162037182644 · Twitter Post
• https://twitter.com/cybrsecpath/status/2046978540009410865 · Twitter Post
• https://twitter.com/infoflowcloud/status/2047430088942108996 · Twitter Post