SB2026071604 - Two vulnerabilities in Mozilla Firefox

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Main Vulnerability Database SB2026071604

SB2026071604 - Two vulnerabilities in Mozilla Firefox

Published: July 16, 2026 Updated: July 21, 2026

Security Bulletin ID SB2026071604
CSH Severity
High
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 100%
  • Low
  • Medium
  • High
  • Critical

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: 8.6 [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]


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: 8.5 [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]


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