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CVE-2021-39357

MEDIUM 4.8 CVSS 3.1
Published
October 21, 2021
Last modified
June 17, 2026
NVD status
Modified
Reported by
security@wordfence.com
Weakness
CWE-79
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Description

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.

Affected WordPress components

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • Leaky Paywall Leaky Paywall — From 4.16.5 (including) to 4.16.5 (including)
  • zeen101 leaky_paywall — Up to and including 4.16.5

References

  • github.com https://github.com/BigTiger2020/word-press/blob/main/Leaky%20Paywall.md Exploit, Third Party Advisory
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset/2615195/leaky-paywall/trunk/class.php Patch, Third Party Advisory
  • wordfence.com https://wordfence.com/vulnerability-advisories/#CVE-2021-39357 Third Party Advisory
  • nvd.nist.gov Official NVD record