CVE-2026-4717
Received Received - Intake

Privilege Escalation in Firefox Netmonitor Before 149/ESR

Publication date: 2026-03-24

Last updated on: 2026-04-13

Assigner: Mozilla Corporation

Description
Privilege escalation in the Netmonitor component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

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Meta Information

Published
2026-03-24
Last Modified
2026-04-13
Generated
2026-07-06
AI Q&A
2026-03-24
EPSS Evaluated
2026-07-05
NVD
CVE-2026-4717
EUVD
EUVD-2026-14849

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox to 149.0 (exc)
mozilla firefox to 140.9.0 (exc)

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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 vulnerability is a privilege escalation issue found in the Netmonitor component of Firefox. It affects versions of Firefox earlier than 149 and Firefox ESR versions earlier than 140.9.

Impact Analysis

The vulnerability allows an attacker to escalate their privileges within the affected Firefox browser, potentially gaining higher access rights than intended. This could lead to unauthorized actions or access to sensitive information within the browser environment.

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