CVE-2021-39357

MEDIUM 4.8CVE-2021-39357 · Published 21/10/2021 · updated 17/06/2026

In short

CVE-2021-39357 is a MEDIUM (CVSS 4.8) vulnerability affecting leaky paywall (zeen101).
Chance of exploitation in the next 30 days (EPSS): 0.92%, higher than 60.4% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
leaky paywall zeen101	`≤ 4.16.5`	No fix yet

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.

References

BigTiger2020/word-press · Exploit
plugins.trac.wordpress.org/changeset/2615195/leaky-paywall/trunk/class.php · Patch
wordfence.com/vulnerability-advisories · Third Party Advisory

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