Information Disclosure in Firefox Security Component
CVE-2026-8965

7.5HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
19 May 2026

What is CVE-2026-8965?

A vulnerability exists in the Firefox web browser that allows for information disclosure through the Document Object Model (DOM) related to its security component. This flaw can potentially expose sensitive information to unauthorized users. Mozilla addressed this issue in Firefox version 151, ensuring users of the browser are protected against this type of risk.

Affected Version(s)

Firefox 151

Thunderbird 151

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2025740
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

Shihab Mirza
.