Information Disclosure and Sandbox Escape in Mozilla Firefox
CVE-2026-12313

4.7MEDIUM

Key Information:

Vendor

Mozilla
Status
Firefox
Vendor
CVE Published:
16 June 2026

What is CVE-2026-12313?

This vulnerability pertains to information disclosure and sandbox escaping within the Security: Process Sandboxing component of Mozilla Firefox. An attacker could exploit this vulnerability to gain unauthorized access to sensitive data or execute malicious actions outside of the intended sandbox environment. It is critically important for users to update to the latest versions of Firefox (152 and Firefox ESR 140.12) to safeguard against these potential exploits and enhance their cybersecurity posture.

Affected Version(s)

Firefox 140.12

Firefox 152

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2040477
https://www.mozilla.org/security/advisories/mfsa2026-57/
https://www.mozilla.org/security/advisories/mfsa2026-58/

CVSS V3.1

Score:
4.7
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

evyatar
.