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CIS Advisories

Multiple Vulnerabilities in Mozilla Products Could Allow for Arbitrary Code Execution

2026-04-21 · Read original ↗

ATT&CK techniques detected

4 predictions
T1190Exploit Public-Facing Application
66%
"on the system could be less impacted than those who operate with administrative user rights. threat intelligence : there are currently no reports of these vulnerabilities being exploited in the wild. systems affected : - firefox versions prior to 150 - firefox esr versions prior …"
T1068Exploitation for Privilege Escalation
63%
"multiple vulnerabilities in mozilla products could allow for arbitrary code execution multiple vulnerabilities in mozilla products could allow for arbitrary code execution ms - isac advisory number : 2026 - 038date ( s ) issued : 04 / 21 / 2026overview : multiple vulnerabilities …"
T1190Exploit Public-Facing Application
49%
"( cve - 2026 - 6773 ) - incorrect boundary conditions in the webrtc component. ( cve - 2026 - 6775 ) - other issue in the networking. ( cve - 2026 - 6777 ) - invalid pointer in the audio / video. ( cve - 2026 - 6778 ) - other issue in the javascript engine component. ( cve - 2026…"
T1068Exploitation for Privilege Escalation
34%
"( cve - 2026 - 6773 ) - incorrect boundary conditions in the webrtc component. ( cve - 2026 - 6775 ) - other issue in the networking. ( cve - 2026 - 6777 ) - invalid pointer in the audio / video. ( cve - 2026 - 6778 ) - other issue in the javascript engine component. ( cve - 2026…"

Summary

Multiple vulnerabilities have been discovered in Mozilla products, the most severe of which could allow for arbitrary code execution. 

  • Mozilla Firefox is a web browser used to access the Internet.
  • Mozilla Firefox ESR is a version of the web browser intended to be deployed in large organizations.
  • Mozilla Thunderbird is an email client.
  • Mozilla Thunderbird ESR is a version of the email client intended to be deployed in large organizations.

Successful exploitation of the most severe of these vulnerabilities could allow for arbitrary code execution. Depending on the privileges associated with the user an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.