Description
The Shariff Wrapper plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'headline' parameter in the [shariff] shortcode in all versions up to, and including, 4.6.20 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The vulnerability occurs because the plugin uses a custom wp_kses implementation with permissive allowed HTML tags, and then performs a str_replace operation that injects HTML after sanitization, allowing event handlers to be introduced through the %total placeholder in the style attribute.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Affected products
- 3uu / Shariff Wrapper0 – 4.6.20
References
- MISChttps://www.wordfence.com/threat-intel/vulnerabilities/id/e037d22a-3d4d-4f70-a749-6d6c552c7553?source=cve
- MISChttps://plugins.trac.wordpress.org/browser/shariff/trunk/shariff.php#L1143
- MISChttps://plugins.trac.wordpress.org/browser/shariff/trunk/shariff.php#L1144
- MISChttps://plugins.trac.wordpress.org/browser/shariff/trunk/shariff.php#L965
- MISChttps://plugins.trac.wordpress.org/browser/shariff/trunk/shariff.php#L868
- MISChttps://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3532532%40shariff&new=3532532%40shariff&sfp_email=&sfph_mail=