Spoofing attack in Mozilla Firefox and Firefox for Android - CVE-2026-12323
Published: June 16, 2026
Vulnerability identifier: #VU134645
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-12323
CWE-ID: CWE-451
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Mozilla
Affected software:
Mozilla Firefox
Firefox for Android
Mozilla Firefox
Firefox for Android
Detailed vulnerability description
The vulnerability allows a remote attacker to spoof content.
The vulnerability exists due to improper UI restriction in the DOM: Core & HTML component when rendering content. A remote attacker can present crafted content to spoof content.
How to mitigate CVE-2026-12323
Install security update from vendor's website.