gVectors wpDiscuz - SQLi (CVE-2020-13640)

CVE-2020-13640 is a critical SQL injection vulnerability in the gVectors wpDiscuz plugin for WordPress versions 5.3.5 and earlier, allowing remote attackers to execute arbitrary SQL commands via the order parameter in wpdLoadMoreComments requests. This flaw could be exploited to compromise database integrity, steal sensitive information, or escalate privileges on affected WordPress sites.

CrowdSec has been tracking this vulnerability and its exploits since 15th of October 2025.

Insights from the CrowdSec network reveal that the attackers trying to exploit CVE-2020-13640 are composed of a fairly even mix of opportunistic and targeted actors. Some attackers employ preliminary reconnaissance, while others use indiscriminate scanning. Telemetry from the CrowdSec network also shows that exploitation activity for CVE-2020-13640 remains steady week-over-week. Attack volumes are consistent with long-term trends, indicating sustained interest from threat actors. CVE-2020-13640 continues to be an active part of the threat landscape and will likely remain this way for the forseeable future.

Attackers exploit the /wp-content/plugins/wpdiscuz/utils/ajax/wpdiscuz-ajax.php endpoint by injecting malicious SQL code into the order parameter of wpdLoadMoreComments POST requests.