CVE-2026-100822
Received Received - Intake

HTTP Spoofing in Firefox and Firefox ESR

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: Mozilla Corporation

Description
Spoofing issue in the Networking: HTTP component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.

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Meta Information

Published
2026-09-29
Last Modified
2026-09-29
Generated
2026-09-29
AI Q&A
2026-09-29
EPSS Evaluated
N/A
NVD
CVE-2026-100822
EUVD
EUVD-2026-88801

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox to 153.4 (inc)
mozilla firefox to 157 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a spoofing vulnerability in the Networking: HTTP component of Firefox. It allows an attacker to impersonate a legitimate website or service by manipulating HTTP responses or requests. The issue was addressed in Firefox ESR 153.4 and Firefox 157.

Impact Analysis

This vulnerability could allow attackers to trick users into visiting fake websites that appear legitimate. This may lead to phishing attacks, credential theft, or malware downloads. Users could unknowingly expose sensitive information or grant unauthorized access to systems.

Mitigation Strategies

Update Firefox ESR to version 153.4 or Firefox to version 157 or later to address the spoofing issue in the Networking: HTTP component.

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