CVE-2026-0887
Unknown Unknown - Not Provided
Clickjacking in Firefox PDF Viewer Causes Information Disclosure

Publication date: 2026-01-13

Last updated on: 2026-04-13

Assigner: Mozilla Corporation

Description
Clickjacking issue, information disclosure in the PDF Viewer component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.
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Meta Information
Published
2026-01-13
Last Modified
2026-04-13
Generated
2026-06-16
AI Q&A
2026-01-14
EPSS Evaluated
2026-06-14
NVD
CVE-2026-0887
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox to 147 (exc)
mozilla firefox_esr to 140.7 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-497 The product does not properly prevent sensitive system-level information from being accessed by unauthorized actors who do not have the same level of access to the underlying system as the product does.
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Executive Summary

This vulnerability is a clickjacking issue that leads to information disclosure in the PDF Viewer component of Firefox versions prior to 147 and Firefox ESR versions prior to 140.7. It allows attackers to bypass security mitigations within the browser's Document Object Model (DOM), potentially enabling unauthorized actions or exploitation within the browser environment. [2]

Impact Analysis

The vulnerability can impact you by allowing attackers to perform unauthorized actions or gain access to information through the PDF Viewer component. This could lead to information disclosure without your consent, potentially compromising your privacy and security while using affected versions of Firefox. [2]

Mitigation Strategies

To mitigate this vulnerability, update Firefox to version 147 or later, or Firefox ESR to version 140.7 or later, as these versions include fixes addressing the clickjacking and information disclosure issues in the PDF Viewer component. [2]

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