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CVE-2021-43531

Medium

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.

SeverityMedium
CVSS4.3
Exploit probability—
ProductMozilla Firefox
PublishedDec 8, 2021
First seenDec 8, 2021

How to fix

Update
  • mozilla firefox94.0 or later

Affected products

ProductAffected versionsFixed in
mozilla firefoxv < 94.094.0

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