# CVE-2026-23744: inspector - Authentication Bypass

> Live exploitation tracking for CVE-2026-23744 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2026-23744

## Key facts

- **Exploitation phase:** Limited Exploitation. The vulnerability is known but shows very limited attacker interest or exploitation activity.
- **CVSS score:** 9.8
- **Public exploit available:** Yes
- **Affected products:** MCPJam inspector
- **Weaknesses:** CWE-306 (Missing Authentication for Critical Function)
- **Tags:** web_application

## Description

MCPJam inspector is the local-first development platform for MCP servers. Versions 1.4.2 and earlier are vulnerable to remote code execution (RCE) vulnerability, which allows an attacker to send a crafted HTTP request that triggers the installation of an MCP server, leading to RCE. Since MCPJam inspector by default listens on 0.0.0.0 instead of 127.0.0.1, an attacker can trigger the RCE remotely via a simple HTTP request. Version 1.4.3 contains a patch.

## CrowdSec analysis

[CVE-2026-23744](https://euvd.enisa.europa.eu/vulnerability/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.

## Timeline

- 2026-01-16: CVE Published. CVE-2026-23744 is published to NVD.
- 2026-02-18: Rule Released. CrowdSec releases a rule to detect CVE-2026-23744 exploitation attempts against the CrowdSec Network.
- 2026-02-18: CrowdSec First Seen. CrowdSec observes in-the-wild exploitation of CVE-2026-23744 for the first time.

## References

- https://github.com/MCPJam/inspector/commit/e6b9cf9d9e6c9cbec31493b1bdca3a1255fe3e7a
- https://github.com/MCPJam/inspector/security/advisories/GHSA-232v-j27c-5pp6
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-23744.yaml

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2026-23744) follows observed exploitation activity for CVE-2026-23744. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.