MFSA2026-42: Security Vulnerabilities fixed in Firefox ESR 115.35.2
Published May 7, 2026
·Updated
Security Vulnerabilities fixed in Firefox ESR 115.35.2
Affected Software
1 affected componentFixes available
Mozilla Firefox ESR<115.35.2
115.35.2
Event History
May 7, 2026
Advisory Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
Frequently Asked Questions
1
What security vulnerabilities are fixed in MFSA2026-42?
MFSA2026-42 addresses multiple vulnerabilities in Firefox ESR 115.35.2.
2
What version of Firefox ESR is affected by MFSA2026-42?
Firefox ESR versions prior to 115.35.2 are affected by the vulnerabilities addressed in MFSA2026-42.
3
How do I update Firefox ESR to fix MFSA2026-42?
To fix MFSA2026-42, you should update to Firefox ESR version 115.35.2 or later.
4
Is it safe to continue using an older version of Firefox ESR after MFSA2026-42?
Continuing to use an older version of Firefox ESR after MFSA2026-42 is not safe and exposes you to unresolved vulnerabilities.
5
What are the implications of not addressing MFSA2026-42?
Failing to address MFSA2026-42 can lead to exploitation of security vulnerabilities, which may compromise user data and system integrity.