# CVE-2026-6771

> Vulnerability · severity: **CRITICAL** (CVSS 9.8).

## Description

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

## Key facts

- **CVE ID:** CVE-2026-6771
- **Published:** 2026-04-21
- **CVSS severity:** CRITICAL
- **CVSS base score:** 9.8
- **CWE codes:** CWE-288

## Affected products

- `mozilla:firefox`
- `mozilla:thunderbird`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-6771

## Citation

> AI Analytics. CVE-2026-6771. Retrieved 2026-07-03 from https://api.ai-analytics.org/cve/CVE-2026-6771. Derived from NIST NVD. Licensed CC0.

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