CVE-2021-39357

Summary

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 Software

Weaknesses

• CWE-79: CWE-79 Cross-site Scripting (XSS)

ADP Enrichment

CVE Program Container

Additional References

• 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

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• 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

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