CVE-2026-8964
Analyzed Analyzed - Analysis Complete
Popup Blocker Spoofing in Firefox

Publication date: 2026-05-19

Last updated on: 2026-05-20

Assigner: Mozilla Corporation

Description
Spoofing issue in the Popup Blocker component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
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Meta Information
Published
2026-05-19
Last Modified
2026-05-20
Generated
2026-06-10
AI Q&A
2026-05-19
EPSS Evaluated
2026-06-08
NVD
CVE-2026-8964
EUVD
EUVD-2026-30915
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox to 151.0.0 (exc)
mozilla thunderbird to 151.0.0 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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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.
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Executive Summary

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.

Impact Analysis

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.

Mitigation Strategies

The vulnerability was fixed in Firefox 151. To mitigate this vulnerability, you should update your Firefox browser to version 151 or later.

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