CVE-2021-24896Public exploitNetwork attack vector

Stored XSS via unescaped form-name attribute

Published Dec 13, 2021 · Updated Aug 3, 2024

Stored XSS in CalderaWP Caldera Forms before 1.9.5 allows remote authenticated users to execute script via a crafted form name. The form builder stores the Form Name and inserts it unescaped into an HTML attribute when the form is edited, so a quote can terminate the attribute and inject markup. Administrator-level access is required even when unfiltered_html is disabled, and a subsequent visit to the form editor triggers the script in that browser.

CVSS severity4.8
Medium
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in CalderaWP Caldera Forms before 1.9.5 allows remote authenticated users to execute script via a crafted form name. The form builder stores the Form Name and inserts it unescaped into an HTML attribute when the form is edited, so a quote can terminate the attribute and inject markup. Administrator-level access is required even when unfiltered_html is disabled, and a subsequent visit to the form editor triggers the script in that browser.

The record

CVE
CVE-2021-24896
Published
Dec 13, 2021
Updated
Aug 3, 2024
Vendor
CalderaWP
Product
Caldera Forms
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Dec 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.9.5 <1.9.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

CalderaWP · Caldera Formsversion=1.9.5 <1.9.5

Published CVSS scores

4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo