Litespeed cache - XSS (CVE-2023-40000)

CVE-2023-40000 is a vulnerability in LiteSpeed Cache that allows attackers to perform stored cross-site scripting (XSS) through improper input neutralization in web page generation.

CrowdSec has been tracking this vulnerability and its exploits since 20th of May 2025.

Data from the CrowdSec community indicates that exploitation of CVE-2023-40000 is highly selective and intelligence-driven. Threat actors use advanced reconnaissance and carefully choose their targets, often as part of sophisticated campaigns or advanced persistent threat operations. Additionally, according to week-over-week analysis by CrowdSec, exploitation of CVE-2023-40000 is surging. Attack volumes are spiking well above historical norms, indicating widespread and escalating interest from threat actors. CVE-2023-40000 is currently experiencing high visibility and active exploitation across the internet.

Observed attack patterns focus on requests leveraging the /wp-json/litespeed/v1/cdn_status URL.