CVE-2021-43531

MEDIUM

Firefox < 94.0 - Origin Validation Error via Web Extension Context Menu

Title source: llm
STIX 2.1

Description

When a user loaded a Web Extensions context menu, the Web Extension could access the post-redirect URL of the element clicked. If the Web Extension lacked the WebRequest permission for the hosts involved in the redirect, this would be a same-origin-violation leaking data the Web Extension should have access to. This was fixed to provide the pre-redirect URL. This is related to CVE-2021-43532 but in the context of Web Extensions. This vulnerability affects Firefox < 94.

References (2)

Core 2
Core References
Issue Tracking, Permissions Required, Vendor Advisory x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1659155

Scores

CVSS v3 4.3
EPSS 0.0008
EPSS Percentile 24.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Details

CWE
CWE-346
Status published
Products (1)
mozilla/firefox < 94.0
Published Dec 08, 2021
Tracked Since Feb 18, 2026