CVE-2020-6809

HIGH

Firefox < 74.0 - Unauthenticated Arbitrary File Read via Web Extension Fetch Request

Title source: llm
STIX 2.1

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.

References (2)

Core 2
Core References
Permissions Required, Vendor Advisory x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1420296

Scores

CVSS v3 7.5
EPSS 0.0046
EPSS Percentile 64.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Details

Status published
Products (1)
mozilla/firefox < 74.0
Published Mar 25, 2020
Tracked Since Feb 18, 2026