CVE-2020-6813

MEDIUM

Firefox < 74.0 - Content Security Policy Bypass via CSS @import Statement

Title source: llm
STIX 2.1

Description

When protecting CSS blocks with the nonce feature of Content Security Policy, the @import statement in the CSS block could allow an attacker to inject arbitrary styles, bypassing the intent of the Content Security Policy. 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=1605814

Scores

CVSS v3 5.3
EPSS 0.0018
EPSS Percentile 38.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Details

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