Medium severity5.5NVD Advisory· Published Oct 21, 2021· Updated Jun 17, 2026
CVE-2021-39357
CVE-2021-39357
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2- Leaky Paywall/Leaky Paywallv5Range: 4.16.5
Patches
Vulnerability mechanics
References
3- plugins.trac.wordpress.org/changeset/2615195/leaky-paywall/trunk/class.phpnvdPatchThird Party Advisory
- github.com/BigTiger2020/word-press/blob/main/Leaky%20Paywall.mdnvdExploitThird Party Advisory
- wordfence.com/vulnerability-advisories/nvdThird Party Advisory
News mentions
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