CVE-2021-24228

Name: CVE-2021-24228
Creator: NVD / NIST
Published: 2021-04-12T14:15:16.04+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.6/10EPSS 1.87%

Last modified Jun 17, 2026

CVE-2021-24228 is a critical-severity vulnerability rated 9.6/10 on the CVSS scale. The Jetpack Scan team identified a Reflected Cross-Site Scripting in the Login Form of the Patreon WordPress plugin before 1.7.2. The WordPress login form (wp-login.php) is hooked by the plugin and offers to allow users to authenticate on the site using their Patreon account. EPSS estimates a 1.87% chance of exploitation in the next 30 days.

Description

The Jetpack Scan team identified a Reflected Cross-Site Scripting in the Login Form of the Patreon WordPress plugin before 1.7.2. The WordPress login form (wp-login.php) is hooked by the plugin and offers to allow users to authenticate on the site using their Patreon account. Unfortunately, some of the error logging logic behind the scene allowed user-controlled input to be reflected on the login page, unsanitized.

Metrics

CVSS 3.1

9.6/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS Probability

1.87%

76.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Patreon	Patreon Wordpress	< 1.7.2

References

https://jetpack.com/2021/03/26/vulnerabilities-found-in-patreon-wordpress-plugin/Exploit, Third Party Advisory
https://wpscan.com/vulnerability/7a5fadb1-3f1c-4779-8ff6-356fccb5269bThird Party Advisory
https://jetpack.com/2021/03/26/vulnerabilities-found-in-patreon-wordpress-plugin/Exploit, Third Party Advisory
https://wpscan.com/vulnerability/7a5fadb1-3f1c-4779-8ff6-356fccb5269bThird Party Advisory

Timeline

Published: Apr 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-24228?

How severe is CVE-2021-24228?

CVE-2021-24228 has a CVSS score of 9.6/10 (CRITICAL severity). The EPSS model estimates a 1.87% probability of exploitation in the next 30 days.

How do I fix CVE-2021-24228?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-24228?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST