CVE-2026-4720 - Vulnerability Analysis
CriticalCVSS: 9.8Last Updated: March 25, 2026
Mozilla Firefox - Remote Code Execution
Published: March 24, 2026Updated: March 25, 2026Remote Exploitable
Overview
Mozilla Firefox < 149 and Firefox ESR < 140.9 contain memory safety bugs caused by memory corruption, letting attackers potentially execute arbitrary code, exploit requires successful memory corruption.
Severity & Score
Severity: Critical
CVSS Score: 9.8
Impact
Attackers can exploit memory corruption to execute arbitrary code, potentially leading to full system compromise.
Mitigation
Update to Firefox 149 and Firefox ESR 140.9 or later.
References
- https://www.mozilla.org/security/advisories/mfsa2026-24/
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2004652%2C2019372%2C2021922%2C2022567%2C2022733
- https://www.mozilla.org/security/advisories/mfsa2026-20/
- https://www.mozilla.org/security/advisories/mfsa2026-22/
- https://www.mozilla.org/security/advisories/mfsa2026-23/
Related Resources
Details
- CVE ID
- CVE-2026-4720
- Severity
- Critical
- CVSS Score
- 9.8
- Type
- undefined
- Status
- unconfirmed
CWE
- CWE-120
CVSS Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H