CVEvulnerability
CVE-2021-39357
4.8 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2021-10-21
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 5.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
- CVSS 3.1 ([email protected])
- 4.8 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
- CVSS 2.0 ([email protected])
- 3.5 LOW — AV:N/AC:M/Au:S/C:N/I:P/A:N
- Weaknesses
- CWE-79
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 configurations
• zeen101 leaky paywall (<= 4.16.5)
Related
Weakness · CWE (1)
- CWE-79 Improper Neutralization of Input During Web Page Generation weakness
References
- https://github.com/BigTiger2020/word-press/blob/main/Leaky%20Paywall.md Exploit, Third Party Advisory
- https://plugins.trac.wordpress.org/changeset/2615195/leaky-paywall/trunk/class.php Patch, Third Party Advisory
- https://wordfence.com/vulnerability-advisories/#CVE-2021-39357 Third Party Advisory
- https://github.com/BigTiger2020/word-press/blob/main/Leaky%20Paywall.md Exploit, Third Party Advisory
- https://plugins.trac.wordpress.org/changeset/2615195/leaky-paywall/trunk/class.php Patch, Third Party Advisory
- https://wordfence.com/vulnerability-advisories/#CVE-2021-39357 Third Party Advisory