Multiple vulnerabilities in Mozilla Firefox ESR

Description

Multiple vulnerabilities were found in Mozilla Firefox ESR. Malicious users can exploit these vulnerabilities to bypass security restrictions, cause denial of service, execute arbitrary code, spoof user interface.

Below is a complete list of vulnerabilities:

1. Denial of service vulnerability in the Audio/Video: Web Codecs component can be exploited remotely to cause denial of service.
2. Denial of service vulnerability in the JavaScript Engine: JIT component can be exploited remotely to cause denial of service.
3. A remote code execution vulnerability in the DOM: Bindings (WebIDL) component can be exploited remotely to execute arbitrary code.
4. Denial of service vulnerability in the JavaScript Engine component can be exploited remotely to cause denial of service.
5. Security vulnerability in the Profile Backup component can be exploited to bypass security restrictions.
6. A remote code execution vulnerability in the Widget: Win32 component can be exploited remotely to execute arbitrary code.
7. Security vulnerability in the Networking: HTTP component can be exploited to bypass security restrictions.
8. A remote code execution vulnerability in the Disability Access APIs component can be exploited remotely to execute arbitrary code.
9. A remote code execution vulnerability in the Audio/Video component can be exploited remotely to execute arbitrary code.
10. Security vulnerability in the DOM: Workers component can be exploited to bypass security restrictions.
11. A remote code execution vulnerability in the Networking: JAR component can be exploited remotely to execute arbitrary code.
12. Security vulnerability in the Enterprise Policies component can be exploited to bypass security restrictions.
13. Security vulnerability in the Security: Process Sandboxing component can be exploited to bypass security restrictions.
14. Denial of service vulnerability in the Widget: Win32 component can be exploited remotely to cause denial of service.
15. Security UI vulnerability in the Form Autofill component can be exploited to spoof user interface.
16. Security vulnerability in the DOM: Security component can be exploited to bypass security restrictions.
17. Security vulnerability in the Security component can be exploited to bypass security restrictions.
18. A remote code execution vulnerability in Thunderbird 140 can be exploited remotely to execute arbitrary code.

Original advisories

• MFSA2026-48

Exploitation

Related products

• Mozilla-Firefox-ESR

CVE list

• CVE-2026-8388
  high
• CVE-2026-8391
  high
• CVE-2026-8401
  critical
• CVE-2026-8946
  critical
• CVE-2026-8947
  high
• CVE-2026-8949
  critical
• CVE-2026-8950
  critical
• CVE-2026-8953
  critical
• CVE-2026-8954
  critical
• CVE-2026-8955
  high
• CVE-2026-8956
  critical
• CVE-2026-8957
  high
• CVE-2026-8958
  critical
• CVE-2026-8959
  critical
• CVE-2026-8961
  unknown
• CVE-2026-8962
  unknown
• CVE-2026-8968
  critical
• CVE-2026-8970
  high
• CVE-2026-8974
  critical
• CVE-2026-8975
  critical

Read more

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