CVE-2020-6809 Information

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Reference

https://bugzilla.mozilla.org/show_bug.cgi?id=1420296 https://www.mozilla.org/security/advisories/mfsa2020-08/ 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

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

7.5