MFSA2026-59: Security Vulnerabilities fixed in Firefox ESR 115.37
Published Jun 16, 2026
·Updated
Security Vulnerabilities fixed in Firefox ESR 115.37
Affected Software
1 affected componentFixes available
Mozilla Firefox ESR<115.37
115.37
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 115.37
Event History
Jun 16, 2026
Advisory Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
Child vulnerabilities
Contains the following vulnerabilities.
Frequently Asked Questions
1
What is the severity of MFSA2026-59?
The severity of MFSA2026-59 is rated as high with a score of 7.
2
How do I fix MFSA2026-59?
You can fix MFSA2026-59 by updating to Firefox ESR version 115.37 or later.
3
What vulnerabilities are addressed in MFSA2026-59?
MFSA2026-59 addresses multiple security vulnerabilities in Firefox ESR.
4
When was MFSA2026-59 published?
MFSA2026-59 was published on June 16, 2026.
5
Which software is affected by MFSA2026-59?
The affected software is Mozilla Firefox ESR.