CVE-2021-24896: The Caldera Forms WordPress plugin before 1.9.5 does not sanitise and escape the Form Name before outputting i

Q: How do I fix CVE-2021-24896?

caldera forms: upgrade to 1.9.5. Exact commands for each OS are on this page.

Q: Is CVE-2021-24896 being exploited?

CVE-2021-24896 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-24896 affect?

CVE-2021-24896 affects caldera forms. Severity is medium (CVSS 4.8). 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 capa

Q: How urgent is CVE-2021-24896?

Priority 34/100. Public exploit reference

Routine

MEDIUM 4.8UPGRADE

CVE-2021-24896 is a medium-severity flaw (CVSS 4.8) affecting caldera forms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-12-13
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: calderaforms

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-12-13 11:15 UTCPublished CVE record published
2026-06-17 03:41 UTCUpdated Record last modified

calderaforms caldera forms UPGRADE

Affected: < 1.9.5

Fixed in: 1.9.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy caldera-forms || rpm -q caldera-forms || caldera-forms --version

2. UPGRADE to 1.9.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade caldera-forms

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade caldera-forms

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-24896?

caldera forms: upgrade to 1.9.5. Exact commands for each OS are on this page.

Is CVE-2021-24896 being exploited?

CVE-2021-24896 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-24896 affect?

CVE-2021-24896 affects caldera forms. Severity is medium (CVSS 4.8). 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 capa

How urgent is CVE-2021-24896?

Priority 34/100. Public exploit reference

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2022-0879 MEDIUM 6.1 UPGRADE The Caldera Forms WordPress plugin before 1.9.7 does not validate and escape the cf-api parameter before outpu

References

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