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.

Related CVEs

CVE-2021-43531

Key Information

GHSA ID

GHSA-r6p5-8pxg-2vcp

Published

December 9, 2021 12:00 AM

Last Modified

December 11, 2021 12:01 AM

CVSS Score

5.0 /10

Primary Ecosystem

Unknown

Primary Package

Unknown

GitHub Reviewed

✗ No

Dataset

Last updated: September 17, 2025 6:29 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.