# CVE-2026-40451

> Vulnerability · severity: **MEDIUM** (CVSS 6.1).

## 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.

## Key facts

- **CVE ID:** CVE-2026-40451
- **Published:** 2026-04-22
- **CVSS severity:** MEDIUM
- **CVSS base score:** 6.1
- **CWE codes:** CWE-79

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40451

## Citation

> AI Analytics. CVE-2026-40451. Retrieved 2026-06-26 from https://api.ai-analytics.org/cve/CVE-2026-40451. Derived from NIST NVD. Licensed CC0.

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