CVE-2026-0887
Clickjacking in Firefox PDF Viewer Causes Information Disclosure
Publication date: 2026-01-13
Last updated on: 2026-04-13
Assigner: Mozilla Corporation
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| mozilla | firefox | to 147 (exc) |
| mozilla | firefox_esr | to 140.7 (exc) |
Helpful Resources
Exploitability
| 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. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
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]
How can this vulnerability impact me? :
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]
What immediate steps should I take to mitigate this vulnerability?
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]