CVE-2021-43531 — Origin Validation Error in Mozilla Firefox
Severity
4.3MEDIUMNVD
EPSS
0.1%
top 75.35%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedDec 8
Latest updateDec 9
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:NExploitability: 2.8 | Impact: 1.4
Affected Packages5 packages
🔴Vulnerability Details
2GHSA▶
GHSA-r6p5-8pxg-2vcp: When a user loaded a Web Extensions context menu, the Web Extension could access the post-redirect URL of the element clicked↗2021-12-09
OSV▶
CVE-2021-43531: When a user loaded a Web Extensions context menu, the Web Extension could access the post-redirect URL of the element clicked↗2021-12-08