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CIS Advisories

Multiple Vulnerabilities in Mozilla Products Could Allow for Arbitrary Code Execution

2026-01-13 · Read original ↗

ATT&CK techniques detected

3 predictions
T1068Exploitation for Privilege Escalation
70%
"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 - 001date ( s ) issued : 01 / 13 / 2026overview : multiple vulnerabilities …"
T1553.001Gatekeeper Bypass
55%
"), or apple® system integrity protection ( sip ) and gatekeeper™. * restrict use of certain websites, block downloads / attachments, block javascript, restrict browser extensions, etc. ( m1021 : restrict web - based content ) o safeguard 9. 2 : use dns filtering services : use dn…"
T1078.001Default Accounts
32%
". run all software as a non - privileged user ( one without administrative privileges ) to diminish the effects of a successful attack. ( m1026 : privileged account management ) o safeguard 4. 7 : manage default accounts on enterprise assets and software : manage default accounts…"

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.