inspector - Authentication Bypass (CVE-2026-23744)

CVE-2026-23744 is a critical remote code execution vulnerability in MCPJam inspector versions 1.4.2 and earlier, where attackers can exploit the default network configuration to send crafted HTTP requests and remotely execute arbitrary code. This flaw allows unauthenticated attackers to compromise affected systems over the network, potentially leading to full system takeover. Upgrading to version 1.4.3 is strongly recommended to mitigate this severe risk.

CrowdSec has been tracking this vulnerability and its exploits since 18th of February 2026.

According to CrowdSec data, while opportunistic exploitation dominates, a portion of threat actors trying to exploit CVE-2026-23744 apply basic targeting methods such as port or service detection. This indicates emerging patterns of selective targeting. CrowdSec data also reveals a clear uptick in attacks involving CVE-2026-23744 over the past week. Activity is above the usual baseline, suggesting growing attention from attackers. This may reflect rising awareness, recent exploit releases, or expanded targeting efforts.

Attackers exploit the /api/mcp/connect endpoint by sending crafted JSON payloads that abuse the command and args fields to trigger remote code execution on vulnerable MCPJam Inspector instances.