CVE-2021-24556

Name: CVE-2021-24556
Creator: NVD / NIST
Published: 2021-08-23T12:15:09.957+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 1.34%

Last modified Jun 17, 2026

CVE-2021-24556 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. The kento_email_subscriber_ajax AJAX action of the Email Subscriber WordPress plugin through 1.1, does not properly sanitise, validate and escape the submitted subscribe_email and subscribe_name POST parameters, inserting them in the DB and then outputting them back in the Subscriber list (/wp-admin/edit.php?post_type=kes_campaign&page=kento_email_subscriber_list_settings), leading a Stored XSS issue.. EPSS estimates a 1.34% chance of exploitation in the next 30 days.

Description

The kento_email_subscriber_ajax AJAX action of the Email Subscriber WordPress plugin through 1.1, does not properly sanitise, validate and escape the submitted subscribe_email and subscribe_name POST parameters, inserting them in the DB and then outputting them back in the Subscriber list (/wp-admin/edit.php?post_type=kes_campaign&page=kento_email_subscriber_list_settings), leading a Stored XSS issue.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

1.34%

67.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Email-Subscriber Project	Email-Subscriber	<= 1.1

References

https://codevigilant.com/disclosure/2021/wp-plugin-email-subscriber/Exploit, Third Party Advisory
https://wpscan.com/vulnerability/f050aedc-f79f-4b27-acac-0cdb33b25af8Exploit, Third Party Advisory
https://codevigilant.com/disclosure/2021/wp-plugin-email-subscriber/Exploit, Third Party Advisory
https://wpscan.com/vulnerability/f050aedc-f79f-4b27-acac-0cdb33b25af8Exploit, Third Party Advisory

Timeline

Published: Aug 23, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-24556?

How severe is CVE-2021-24556?

CVE-2021-24556 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.34% probability of exploitation in the next 30 days.

How do I fix CVE-2021-24556?

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-2021-24556?

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

Scan your code now

Source: NVD / NIST