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.

According to CrowdSec data, while opportunistic exploitation dominates, a portion of threat actors trying to exploit CVE-2023-40000 apply basic targeting methods such as port or service detection. This indicates emerging patterns of selective targeting. 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.