CVE-2020-6809 Information disclosure in Firefox

What is CVE-2020-6809?

CVE-2020-6809 is a high-severity vulnerability in Mozilla Firefox, published on 25 Mar 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

When a Web Extension had the all-urls permission and made a fetch request with a mode set to 'same-origin', it was possible for the Web Extension to read local files. This vulnerability affects Firefox < 74.

Which versions are affected by CVE-2020-6809?

It affects 1 product.

Products include Mozilla Firefox.

How do I fix CVE-2020-6809?

Upgrade to a fixed version.

Is CVE-2020-6809 being exploited?

There is no known exploitation of CVE-2020-6809 in the wild and no public exploit code.

Other vulnerabilities in Mozilla Firefox

• CVE-2019-11708 Mozilla Firefox and Thunderbird Sandbox Escape Exploited Critical 10.0
• CVE-2010-3765 Mozilla Multiple Products Remote Code Execution Exploited Critical 9.8
• CVE-2022-26486 Mozilla Firefox Use-After-Free Exploited Critical 9.6
• CVE-2022-26485 Mozilla Firefox Use-After-Free Exploited High 8.8
• CVE-2019-11707 Mozilla Firefox and Thunderbird Type Confusion Exploited High 8.8

All Mozilla Firefox vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-2m96-7r2c-fq6j, UBUNTU-CVE-2020-6809.