CVE-2021-39321 Sassy Social Share 3.3.23 PHP Object Injection

High 8.8 Published 21 Oct 2021 Updated 31 Mar 2025

Underprivileged authenticated users can achieve code execution via PHP object injection in the Sassy Social Share WordPress plugin due to unsafe deserialization.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-39321?

CVE-2021-39321 is a high-severity unsafe deserialization vulnerability in Sassy Social Share, published on 21 Oct 2021. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-863, CWE-502

Which versions are affected by CVE-2021-39321?

It affects 1 product.

Products include Heateor Sassy Social Share.

How do I fix CVE-2021-39321?

No fix has been published for CVE-2021-39321 yet. Limit exposure of the affected software until one is available.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2021-39321 being exploited?

There is no known exploitation of CVE-2021-39321 in the wild and no public exploit code.

Sources

Also known as GHSA-pxqp-jhw5-pvjr.