What is CVE-2021-43531?

CVE-2021-43531 is a vulnerability that allows a Web Extension in Mozilla Firefox to access the post-redirect URL of a clicked element in a Web Extensions context menu, potentially leaking sensitive data.

How does CVE-2021-43531 affect Mozilla Firefox?

CVE-2021-43531 affects Mozilla Firefox versions up to and excluding version 94.0.

What is the severity of CVE-2021-43531?

CVE-2021-43531 has a severity value of 4, indicating a medium severity.

How can I fix CVE-2021-43531?

To fix CVE-2021-43531, update Mozilla Firefox to version 94.0 or later.

Where can I find more information about CVE-2021-43531?

You can find more information about CVE-2021-43531 on the Mozilla Firefox website and in the Mozilla Security Advisory MFSB2021-48.

Vulnerability/
CVE-2021-43531

medium

4.3

CWE

346

2/11/2021

8/12/2021

21/11/2024

CVE-2021-43531

First published: Tue Nov 02 2021(Updated: )

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.

Credit: security@mozilla.org security@mozilla.org

Affected Software	Affected Version	How to fix
Mozilla Firefox	<94	94
Mozilla Firefox	<94.0
	<94.0

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

MFSA2021-48

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

What is CVE-2021-43531?
CVE-2021-43531 is a vulnerability that allows a Web Extension in Mozilla Firefox to access the post-redirect URL of a clicked element in a Web Extensions context menu, potentially leaking sensitive data.
How does CVE-2021-43531 affect Mozilla Firefox?
CVE-2021-43531 affects Mozilla Firefox versions up to and excluding version 94.0.
What is the severity of CVE-2021-43531?
CVE-2021-43531 has a severity value of 4, indicating a medium severity.
How can I fix CVE-2021-43531?
To fix CVE-2021-43531, update Mozilla Firefox to version 94.0 or later.
Where can I find more information about CVE-2021-43531?
You can find more information about CVE-2021-43531 on the Mozilla Firefox website and in the Mozilla Security Advisory MFSB2021-48.

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