UBUNTU-CVE-2021-43531

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    UBUNTU-CVE-2021-43531

    Published: 8 Dec 2021Last Modified: 16 Jul 2025
    Upstream:
    CVE-2021-43531

    Summary:

    Details: 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.

    References: https://ubuntu.com/security/CVE-2021-43531, https://www.mozilla.org/en-US/security/advisories/mfsa2021-48/#CVE-2021-43531, https://bugzilla.mozilla.org/show_bug.cgi?id=1659155, https://www.mozilla.org/security/advisories/mfsa2021-48/, https://www.cve.org/CVERecord?id=CVE-2021-43531

    Affected packages

    Package

    Name: firefox

    Purl: pkg:deb/ubuntu/[email protected]+build3-0ubuntu0.18.04.1?arch=source&distro=bionic

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -94.0+build3-0ubuntu0.18.04.1

    Affected versions

    56.0+build6-0ubuntu1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2021-43531 | CVE-DB