PT-2021-22563 · WordPress · Leaky Paywall

Published 2021-10-21 · Updated 2021-10-25 · CVE-2021-39357

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions: Leaky Paywall WordPress plugin versions up to and including 4.16.5

Description: The issue is related to Stored Cross-Site Scripting due to insufficient input validation and sanitization via the ~/class.php file. This allows attackers with administrative user access to inject arbitrary web scripts. The problem affects multi-site installations where unfiltered html is disabled for administrators, and sites where unfiltered html is disabled.

Recommendations: For versions up to and including 4.16.5, update to a version later than 4.16.5 to resolve the issue. As a temporary workaround, consider restricting administrative access and enabling unfiltered html for administrators to minimize the risk of exploitation.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2021-39357

Affected Products

Leaky Paywall

References · 6

• 🔥 https://github.com/BigTiger2020/word-press/blob/main/Leaky%20Paywall.md · Exploit
• https://osv.dev/vulnerability/CVE-2021-39357 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-39357 · Security Note
• https://plugins.trac.wordpress.org/changeset/2615195/leaky-paywall/trunk/class.php · Patch
• https://t.me/cibsecurity/30986 · Telegram Post
• https://wordfence.com/vulnerability-advisories/#CVE-2021-39357 · Note