Caldera forms <= 1.9.4 - Admin+ Stored Cross-Site Scripting
Strategic Overview
- Status
- Patched in 1.9.5
- Affected Plugin
- Caldera Forms – More Than Contact Forms
- Affected Version
< 1.9.5- CVSS
- 4.8Medium
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2021-24896
At a glance
CVE-2021-24896 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Caldera Forms WordPress plugin, affecting versions < 1.9.5. It carries a CVSS score of 4.8 (reachable over the network; low attack complexity). The issue is fixed in version 1.9.5; sites on affected versions should update now. Disclosed November 2021, reported by Dhananjay Garg.
Vulnerability Overview
The Caldera Forms WordPress plugin before 1.9.5 does not sanitise and escape the Form Name before outputting it in attributes, which could allow high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Reaching this weakness in Caldera Forms < 1.9.5 takes a caller who can reach the endpoint. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.
Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Caldera Forms the fix is 1.9.5: builds < 1.9.5 are affected, anything from 1.9.5 onward is not.
Remediation
Update to version 1.9.5, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to Caldera Forms: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Caldera Forms 1.9.5 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Same weakness class
Other vulnerabilities in Caldera Forms – More Than Contact Forms
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