Caldera Forms <= 1.5.4 - Authenticated Cross-Site Scripting (XSS)

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Description 
Version 1.5.4 and earlier of Caldera Forms is vulnerable to a reflected cross-site scripting vulnerability in the “edit” parameter, which is not properly escaped before being printed in an HTML attribute. An attacker can use this to craft URLs that, when clicked, result in malicious JavaScript being executed. Because Caldera Forms uses ‘wp_rest’ nonces to access the WordPress REST API – a common practice among plugin developers – this Javascript may include anything the user is capable of doing in the REST API.
Proof of Concept 
[site_url]/wp-admin/admin.php?page=caldera-forms&edit="><script>alert(String.fromCharCode(88%2C83%2C83))<%2Fscript> (1.5.3-4)

[site_url]/wp-admin/admin.php?page=caldera-forms&edit=CF598a16cde8524%3Cimg+url%3D%22%3E%3Cscript%3Ealert%281%29%3C%2Fscript%3E [<1.5.3]

Affects Plugin

caldera-forms
fixed in version 1.5.5

References

URL https://wrbrand.com/2017/08/08/authenticated-xss-in-caldera-forms-1-5-4/
URL https://calderaforms.com/updates/caldera-forms-1-5-5/

Classification

Type XSS
OWASP Top 10 A3: Cross-Site Scripting (XSS)
CWE CWE-79

Miscellaneous

Submitter Will Brand
Submitter Website https://wrbrand.com/
Submitter Twitter wrbrand
Views 211
Verified No
WPVDB ID 8940

Timeline

Publicly Published 2017-09-08 (10 months ago)
Added 2017-10-30 (8 months ago)
Last Updated 2017-10-30 (8 months ago)

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