Firefox Vulnerabilities

Security vulnerability tracking for Mozilla Firefox

Last updated: Feb 24, 2026
Total CVEs

3

Critical

28

With Exploits

32

Last 30 Days

0

Vulnerability Timeline

3 vulnerabilities discovered over time for Firefox

Severity Distribution

Critical28
933%
High3
100%
Medium1
33%
Low0
0%
DescriptionVendor / ProductExploit Status
CVE-2026-27837.5

This vulnerability allows an attacker to access sensitive information from a user's system through a flaw in Firefox's JavaScript engine. It affects versions of Firefox and Thunderbird before 148 and 140.8, meaning users need to update their software to protect against potential data leaks.

mozillafirefox
Exploit Available
about 1 month agoFeb 24, 2026
CVE-2026-27698.8

This vulnerability allows an attacker to execute malicious code on a user's system by exploiting a flaw in how Firefox and Thunderbird manage data storage. It affects versions prior to 148 for Firefox and 148 for Thunderbird, meaning users with outdated software are at risk if they visit a compromised website or open a malicious email.

mozillafirefox
Exploit Available
about 1 month agoFeb 24, 2026
CVE-2026-24478.8

This vulnerability allows an attacker to potentially execute malicious code on a user's system by exploiting a flaw in how Firefox and Thunderbird handle video data. It affects specific versions of these applications, so users need to ensure they are running the latest updates to stay protected.

mozillafirefox
Exploit Available
about 2 months agoFeb 16, 2026

About Mozilla Firefox Security

This page provides comprehensive security vulnerability tracking for Mozilla Firefox. Our database includes all CVEs affecting this product, updated in real-time from official sources.

Each vulnerability listing includes detailed CVSS severity analysis, exploit availability status, AI-generated explanations, and direct links to official security patches and vendor advisories.

Security Recommendations

  • • Always keep Firefox updated to the latest version
  • • Subscribe to security advisories from Mozilla
  • • Monitor this page for new vulnerabilities affecting your version
  • • Prioritize patching critical and high severity issues immediately