CVE-2021-39321

Name: CVE-2021-39321
Creator: NVD / NIST
Published: 2021-10-21T20:15:07.857+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.98%

Last modified Jun 17, 2026

CVE-2021-39321 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Version 3.3.23 of the Sassy Social Share WordPress plugin is vulnerable to PHP Object Injection via the wp_ajax_heateor_sss_import_config AJAX action due to deserialization of unvalidated user supplied inputs via the import_config function found in the ~/admin/class-sassy-social-share-admin.php file. This can be exploited by underprivileged authenticated users due to a missing capability check on the import_config function.. EPSS estimates a 1.98% chance of exploitation in the next 30 days.

Description

Version 3.3.23 of the Sassy Social Share WordPress plugin is vulnerable to PHP Object Injection via the wp_ajax_heateor_sss_import_config AJAX action due to deserialization of unvalidated user supplied inputs via the import_config function found in the ~/admin/class-sassy-social-share-admin.php file. This can be exploited by underprivileged authenticated users due to a missing capability check on the import_config function.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

1.98%

78.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Heateor	Sassy Social Share	3.3.23

References

https://plugins.trac.wordpress.org/changeset/2600464/sassy-social-share/trunk/admin/class-sassy-social-share-admin.phpPatch, Third Party Advisory
https://www.wordfence.com/blog/2021/10/vulnerability-patched-in-sassy-social-share-plugin/Exploit, Third Party Advisory
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39321Third Party Advisory
https://plugins.trac.wordpress.org/changeset/2600464/sassy-social-share/trunk/admin/class-sassy-social-share-admin.phpPatch, Third Party Advisory
https://www.wordfence.com/blog/2021/10/vulnerability-patched-in-sassy-social-share-plugin/Exploit, Third Party Advisory
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39321Third Party Advisory

Timeline

Published: Oct 21, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39321?

How severe is CVE-2021-39321?

CVE-2021-39321 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.98% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39321?

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-2021-39321?

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

Scan your code now

Source: NVD / NIST