MFSA2026-31: Security Vulnerabilities fixed in Firefox ESR 115.35
Published Apr 21, 2026
·Updated
Security Vulnerabilities fixed in Firefox ESR 115.35
Affected Software
1 affected componentFixes available
Mozilla Firefox ESR<115.35
115.35
Event History
Apr 21, 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 MFSA2026-31?
The severity of MFSA2026-31 is rated as high due to the potential impact of the vulnerabilities on user security.
2
How do I fix MFSA2026-31?
To fix MFSA2026-31, update to Firefox ESR version 115.35 or later.
3
What vulnerabilities are addressed in MFSA2026-31?
MFSA2026-31 addresses multiple security vulnerabilities including issues that may lead to remote code execution.
4
Which versions of Firefox ESR are affected by MFSA2026-31?
Firefox ESR versions prior to 115.35 are affected by the vulnerabilities detailed in MFSA2026-31.
5
Is there any risk if I do not update to mitigate MFSA2026-31?
Yes, not updating may leave your system vulnerable to exploits targeting the fixed vulnerabilities in MFSA2026-31.