CVE-2021-39357

    Dashboard / Vulnerabilities / CVE-2021-39357

    CVE-2021-39357

    Published: 21 Oct 2021Last Modified: 10 Mar 2026

    Summary:

    Details: The Leaky Paywall WordPress plugin is vulnerable to Stored Cross-Site Scripting due to insufficient input validation and sanitization via the ~/class.php file which allowed attackers with administrative user access to inject arbitrary web scripts, in versions up to and including 4.16.5. This affects multi-site installations where unfiltered_html is disabled for administrators, and sites where unfiltered_html is disabled.

    References: , https://wordfence.com/vulnerability-advisories/#CVE-2021-39357, https://plugins.trac.wordpress.org/changeset/2615195/leaky-paywall/trunk/class.php, https://github.com/BigTiger2020/word-press/blob/main/Leaky%20Paywall.md

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    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-2021-39357 | CVE-DB