CVE-2026-8961
Analyzed Analyzed - Analysis Complete
Spoofing in Firefox Form Autofill Component

Publication date: 2026-05-19

Last updated on: 2026-05-20

Assigner: Mozilla Corporation

Description
Spoofing issue in the Form Autofill component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
CVSS Scores
EPSS Scores
Probability:
Percentile:
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-2026-8961
EUVD
EUVD-2026-30912
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
mozilla firefox to 151.0.0 (exc)
mozilla firefox to 140.11.0 (exc)
mozilla thunderbird to 140.11 (exc)
mozilla thunderbird to 151.0.0 (exc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
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 Quick Actions
Instant insights powered by AI
Executive Summary

This vulnerability is a spoofing issue found in the Form Autofill component of Mozilla Firefox. It allows an attacker to potentially deceive users by presenting false or misleading information in form fields.

The issue was addressed and fixed in Firefox version 151 and Firefox ESR 140.11.

Impact Analysis

The spoofing vulnerability in the Form Autofill component can lead to users being tricked into entering sensitive information into fraudulent form fields. This can result in unauthorized disclosure of personal or financial data.

Mitigation Strategies

To mitigate this vulnerability, update your Firefox browser to version 151 or later, or Firefox ESR to version 140.11 or later, where the issue has been fixed.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-8961. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart