Vulnerability · Published Oct 21, 2021 · Assigned by Wordfence

CVE-2021-39357Leaky Paywall <= 4.16.5 Authenticated Stored Cross-Site Scripting

Medium 5.5

In plain English

A medium-severity cross-site scripting in Leaky Paywall from Leaky Paywall. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities).

Severity (CVSS 3.1)5.5Medium

Exploit odds (30 days)0.9%top 39.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Leaky Paywall	Leaky Paywall	4.16.5 – through 4.16.5

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N

References

https://plugins.trac.wordpress.org/changeset/2615195/leaky-paywall/trunk/class.php x_refsource_MISC
https://wordfence.com/vulnerability-advisories/#CVE-2021-39357 x_refsource_MISC
https://github.com/BigTiger2020/word-press/blob/main/Leaky%20Paywall.md x_refsource_MISC