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
Description
Privilege escalation in the Netmonitor component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| mozilla | firefox | to 149.0 (exc) |
| mozilla | firefox | to 140.9.0 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
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.
How can this vulnerability impact me? :
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.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know
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