CVE-2026-6763
Mitigation Bypass in Firefox File Handling Component
Publication date: 2026-04-21
Last updated on: 2026-04-22
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 150.0 (exc) |
| mozilla | firefox | to 140.10.0 (exc) |
| mozilla | thunderbird | From 140.0 (inc) to 140.10.0 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-693 | The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a mitigation bypass in the File Handling component of Mozilla Firefox. It means that a security measure designed to prevent certain file handling issues was circumvented, potentially allowing unintended behavior or exploitation. The issue was fixed in Firefox version 150 and Firefox ESR 140.10.
How can this vulnerability impact me? :
Exploitation of this vulnerability could allow an attacker to bypass security mitigations related to file handling in Firefox, potentially leading to unauthorized actions involving files. This might result in security risks such as data exposure or execution of malicious files, depending on the context in which the vulnerability is exploited.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, update Firefox to version 150 or later, or Firefox ESR to version 140.10 or later, where the issue has been fixed.