#VU48469 Information disclosure in Mozilla Firefox and Firefox ESR

Published: 2020-11-17

Vulnerability identifier: #VU48469

Vulnerability risk: Low


CVE-ID: CVE-2020-26965


Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Mozilla Firefox
Client/Desktop applications / Web browsers
Firefox ESR
Client/Desktop applications / Web browsers

Vendor: Mozilla


The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to the way software keyboards are handled by the Firefox. Some websites have a feature "Show Password" where clicking a button will change a password field into a textbook field, revealing the typed password. If, when using a software keyboard that remembers user input, a user typed their password and used that feature, the type of the password field was changed, resulting in a keyboard layout change and the possibility for the software keyboard to remember the typed password.

A local user leverage this behavior to gain access to passwords, stored by software keyboards.

Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 60.0 - 82.0.3

Firefox ESR: 78.0 - 78.4.1, 68.0 - 68.12.0, 60.0 - 60.9.0


External links

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

Latest bulletins with this vulnerability