CVE-2021-23435

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    CVE-2021-23435

    Published: 12 Sept 2021Last Modified: 9 Jul 2026

    Summary:

    Details: This affects the package clearance before 2.5.0. The vulnerability can be possible when users are able to set the value of session[:return_to]. If the value used for return_to contains multiple leading slashes (/////example.com) the user ends up being redirected to the external domain that comes after the slashes (http://example.com).

    References: https://snyk.io/vuln/SNYK-RUBY-CLEARANCE-1577284, https://github.com/thoughtbot/clearance/pull/945

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -3691c23b8447071ba3f6aa6f6f9e30dd3bc2ed6f

    Affected versions

    v2.4.0

    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
    CVE-2021-23435 | CVE-DB