SB2026071604 - Two vulnerabilities in Mozilla Firefox

Description

This security bulletin contains information about 2 vulnerabilities.

1) Access of Uninitialized Pointer (CVE-ID: CVE-2026-15718)

CWE-ID: CWE-824 - Access of Uninitialized Pointer

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to an invalid pointer in the JavaScript: WebAssembly component when processing web content. A remote attacker can trigger the vulnerable component to execute arbitrary code.

2) Improper access control (CVE-ID: CVE-2026-15719)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber

The vulnerability allows a remote attacker to manipulate DOM elements.

The vulnerability exists due to improper access restrictions within the Navigation component. A remote attacker can trick the victim into visiting a specially crafted website and manipulate arbitrary DOM object, bypassing site isolation in DOM.

Remediation

Install update from vendor's website.

References

• https://www.mozilla.org/en-US/security/advisories/mfsa2026-67/
• https://bugzilla.mozilla.org/show_bug.cgi?id=2045443