CVE-2021-43531

2021-12-0800:00:00

ubuntu.com

5.8 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:N/C:P/I:P/A:N

6.1 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

0.001 Low

EPSS

Percentile

33.7%

JSON

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.