CVE-2021-39357
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…
Does this matter?
Lower severity and a low EPSS score (0.92%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 4.8 MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 0.92% probability · 58th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- zeen101/leaky paywall
- Source
- security@wordfence.com
References
- https://github.com/BigTiger2020/word-press/blob/main/Leaky%20Paywall.mdExploit, Third Party Advisory
- https://plugins.trac.wordpress.org/changeset/2615195/leaky-paywall/trunk/class.phpPatch, Third Party Advisory
- https://wordfence.com/vulnerability-advisories/#CVE-2021-39357Third Party Advisory
- https://github.com/BigTiger2020/word-press/blob/main/Leaky%20Paywall.mdExploit, Third Party Advisory
- https://plugins.trac.wordpress.org/changeset/2615195/leaky-paywall/trunk/class.phpPatch, Third Party Advisory
- https://wordfence.com/vulnerability-advisories/#CVE-2021-39357Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.