What’s Vulnerable › Vulnerabilities

CVE-2026-84127: Information disclosure in the WebExtensions component in Firefox for Android

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-09-01 · updated 2026-09-03
• Weakness: CWE-200

Description

Information disclosure in the WebExtensions component in Firefox for Android. This vulnerability was fixed in Firefox 155.

Affected products

• Mozilla Firefox for Android: before 155.0 — fixed in 155.0

How to fix

Upgrade to a fixed version: Mozilla Firefox for Android 155.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1699444
• https://www.mozilla.org/security/advisories/mfsa2026-82/

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