CVE-2026-8960
Analyzed
Analyzed - Analysis Complete
Spoofing in Firefox WebExtensions
Publication date: 2026-05-19
Last updated on: 2026-05-20
Assigner: Mozilla Corporation
Description
Description
Spoofing issue in WebExtensions. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
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
KEV
| CWE ID | Description |
|---|---|
| CWE-290 | This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a spoofing issue in WebExtensions within Mozilla Firefox. It was addressed and fixed in Firefox version 151.
How can this vulnerability impact me? :
The vulnerability could allow an attacker to spoof or impersonate content or functionality within WebExtensions, potentially misleading users or causing them to trust malicious extensions or content.
What immediate steps should I take to mitigate this vulnerability?
The vulnerability is fixed in Firefox 151. To mitigate this issue, you should update your Firefox browser to version 151 or later.
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