What is CVE-2026-23744?

CVE-2026-23744 is a critical-severity vulnerability in Mcpjam Inspector, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-01-16.

How severe is CVE-2026-23744?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2026-23744 known to be exploited?

45 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Mcpjam Inspector

CVE-2026-23744

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.

Vulnerability class: Broken Authentication

EPSS: 0.450 (98.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Mcpjam Inspector — versions <= 1.4.2

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

Public proof-of-concept exploits

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-23744?: CVE-2026-23744 is a critical-severity vulnerability in Mcpjam Inspector, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-01-16.
How severe is CVE-2026-23744?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2026-23744 known to be exploited?: 45 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.