CVSS 3.1
4.8 mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:NCVE-2021-39357
Medium (4.8) in zeen101 leaky paywall. EPSS 0.9% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 0.9% chance of exploitation in the next 30 days; higher than 60% of CVEs (scores of 2026-10-31)
- CWE
- CWE-79
- Published
- Modified
- Record from
- the NVD, synced
Affected
- zeen101:leaky_paywall
References
- https://github.com/BigTiger2020/word-press/blob/main/Leaky%20Paywall.md
- https://plugins.trac.wordpress.org/changeset/2615195/leaky-paywall/trunk/class.php
- https://wordfence.com/vulnerability-advisories/#CVE-2021-39357
- https://github.com/BigTiger2020/word-press/blob/main/Leaky%20Paywall.md
- https://plugins.trac.wordpress.org/changeset/2615195/leaky-paywall/trunk/class.php