Information Disclosure in Firefox IP Protection Component
CVE-2026-8966

7.5HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
19 May 2026

What is CVE-2026-8966?

An information disclosure vulnerability exists within the IP Protection component of Firefox. This flaw can potentially allow unauthorized access to sensitive data, impacting user privacy and confidentiality. The vulnerability has been resolved in Firefox version 151, which addresses this security concern effectively. Users are encouraged to update to the latest version to ensure their systems remain secure.

Affected Version(s)

Firefox 151

Thunderbird 151

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2025849
https://www.mozilla.org/security/advisories/mfsa2026-46/
https://www.mozilla.org/security/advisories/mfsa2026-50/

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Rintaro Kobayashi
.