MFSA2026-98: Security Vulnerabilities fixed in Firefox ESR 115.42
Published Sep 29, 2026
·Updated
Security Vulnerabilities fixed in Firefox ESR 115.42
Affected Software
1 affected componentFixes available
Mozilla Firefox ESR<115.42
115.42
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 115.42 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 115.42
Event History
Sep 29, 2026
Advisory Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
Child vulnerabilities
Contains the following vulnerabilities.
- CVE-2026-100756
- CVE-2026-100757
- CVE-2026-100758
- CVE-2026-100759
- CVE-2026-100762
- CVE-2026-92035
- CVE-2026-100766
- CVE-2026-100767
- CVE-2026-100770
- CVE-2026-100771
- CVE-2026-100773
- CVE-2026-100774
- CVE-2026-100775
- CVE-2026-100777
- CVE-2026-100778
- CVE-2026-100779
- CVE-2026-100780
- CVE-2026-100781
- CVE-2026-100782
- CVE-2026-100783
- CVE-2026-100784
- CVE-2026-100785
- CVE-2026-100786
- CVE-2026-100789
- CVE-2026-100790
- CVE-2026-100791
- CVE-2026-100832
- CVE-2026-100797
- CVE-2026-100803
- CVE-2026-100819
- CVE-2026-100821
Frequently Asked Questions
1
What version should organizations deploy to receive the fixes?
Deploy Firefox ESR 115.42, which includes the security fixes covered by this advisory.