CVE-2026-8964
Popup Blocker Spoofing in Firefox
Publication date: 2026-05-19
Last updated on: 2026-05-20
Assigner: Mozilla Corporation
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| mozilla | firefox | to 151.0.0 (exc) |
| mozilla | thunderbird | to 151.0.0 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-451 | The user interface (UI) does not properly represent critical information to the user, allowing the information - or its source - to be obscured or spoofed. This is often a component in phishing attacks. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a spoofing issue found in the Popup Blocker component of Mozilla Firefox. It allows an attacker to potentially deceive users by presenting misleading or fake popup content. The issue was addressed and fixed in Firefox version 151.
How can this vulnerability impact me? :
The impact of this vulnerability could include users being tricked by deceptive popups, which might lead to phishing attacks, unauthorized actions, or exposure to malicious content. This undermines user trust and security while browsing.
What immediate steps should I take to mitigate this vulnerability?
The vulnerability was fixed in Firefox 151. To mitigate this vulnerability, you should update your Firefox browser to version 151 or later.