CVE-2026-16377
Received Received - Intake

Mitigation Bypass in Firefox PDF Viewer

Publication date: 2026-07-21

Last updated on: 2026-07-21

Assigner: Mozilla Corporation

Description
Mitigation bypass in the PDF Viewer component. This vulnerability was fixed in Firefox 153 and Firefox ESR 140.13.

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Meta Information

Published
2026-07-21
Last Modified
2026-07-21
Generated
2026-07-21
AI Q&A
2026-07-21
EPSS Evaluated
N/A
NVD
CVE-2026-16377
EUVD
EUVD-2026-46213

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox 153
mozilla firefox_esr 140.13

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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 mitigation bypass in the PDF Viewer component of Firefox. It allows attackers to bypass certain security measures that were meant to prevent exploitation. The issue was addressed in Firefox version 153 and Firefox ESR version 140.13.

Impact Analysis

If exploited, this vulnerability could allow attackers to bypass security restrictions, potentially leading to unauthorized access or execution of malicious code on your system. Users of affected Firefox versions should update immediately to mitigate the risk.

Mitigation Strategies

Update Firefox to version 153 or later and Firefox ESR to version 140.13 or later to address the mitigation bypass in the PDF Viewer component.

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