WordPress Plugin Vulnerabilities
Custom Content Shortcode < 4.0.2 - Authenticated Stored Cross-Site Scripting
Description
The plugin does not escape custom fields before outputting them, which could allow Contributor+ (v < 4.0.1) or Admin+ (v < 4.0.2) users to perform Cross-Site Scripting attacks even when the unfiltered_html is disallowed. Please note that such attack is still possible by admin+ in single site blogs by default (but won't be when the unfiltered_html is disallowed)
Proof of Concept
As a contributor, add a custom field in a post (while in a post editor, open the Options panel > Preferences > Panels and enable the Custom Fields), such as test_xss with a value of <script>alert(/XSS/)</script> Then add the following shortcode to the post [field test_xss] and view/preview it to trigger the XSS
Affects Plugins
Fixed in 4.0.2 References
CVE
Classification
Type
XSS
OWASP top 10
CWE
CVSS
Miscellaneous
Original Researcher
Francesco Carlucci
Submitter
Francesco Carlucci
Submitter website
Submitter twitter
Verified
Yes
WPVDB ID
Timeline
Publicly Published
2022-02-02 (about 2 years ago)
Added
2022-02-02 (about 2 years ago)
Last Updated
2022-04-09 (about 2 years ago)
WPScan 