Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Zeen101 | Leaky Paywall | <= 4.16.5 |
Related Weaknesses (CWE)
References
- https://github.com/BigTiger2020/word-press/blob/main/Leaky%20Paywall.mdExploitThird Party Advisory
- https://plugins.trac.wordpress.org/changeset/2615195/leaky-paywall/trunk/class.pPatchThird Party Advisory
- https://wordfence.com/vulnerability-advisories/#CVE-2021-39357Third Party Advisory
- https://github.com/BigTiger2020/word-press/blob/main/Leaky%20Paywall.mdExploitThird Party Advisory
- https://plugins.trac.wordpress.org/changeset/2615195/leaky-paywall/trunk/class.pPatchThird Party Advisory
- https://wordfence.com/vulnerability-advisories/#CVE-2021-39357Third Party Advisory
FAQ
What is CVE-2021-39357?
CVE-2021-39357 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 administrati...
How severe is CVE-2021-39357?
CVE-2021-39357 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-39357?
Check the references section above for vendor advisories and patch information. Affected products include: Zeen101 Leaky Paywall.