TI-2021-16724 Aliases CVE-2021-39357 GHSA-wvcr-x5w5-c6rh

Leaky Paywall <= 4.16.5 Authenticated Stored Cross-Site Scripting

LOW 27CWE-79Published 2021-10-21 · Updated 2025-02-14

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00915 60th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Leaky Paywall	Leaky Paywall	4.16.5 – 4.16.5	—	No fix listed	CNA

Leaky Paywall VendorLeaky Paywall Affected 4.16.5 – 4.16.5 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:zeen101:leaky_paywall::::::wordpress::*	up to 4.16.5	Vulnerable	ZEEN101

cpe:2.3:a:zeen101:leaky_paywall:*:*:*:*:*:wordpress:*:* Versions up to 4.16.5 Vulnerable ·ZEEN101

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-39357
2026-10-03 Alias added: GHSA-wvcr-x5w5-c6rh

References

TI-2024-22181 WordPress Leaky Paywall plugin <= 4.20.8 - Price Manipulation vulnerability CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences