How severe is CVE-2026-23744?

CVE-2026-23744 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-23744 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 44% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-23744?

CVE-2026-23744 affects Mcpjam Inspector. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-23744?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-23744 have an EU (EUVD) identifier?

Yes. CVE-2026-23744 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2859.

When was CVE-2026-23744 published?

CVE-2026-23744 was published on 2026-01-16 and last updated on 2026-06-17.

CVE-2026-23744

CVE-2026-23744 is a critical-severity vulnerability in Mcpjam Inspector with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 44% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-306.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 44% (99th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-2859
Weakness: CWE-306
Affected product: Mcpjam Inspector
Published: 2026-01-16
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-23744?: CVE-2026-23744 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-23744 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 44% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-23744?: CVE-2026-23744 affects Mcpjam Inspector. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-23744?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-23744 have an EU (EUVD) identifier?: Yes. CVE-2026-23744 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2859.
When was CVE-2026-23744 published?: CVE-2026-23744 was published on 2026-01-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mcpjam:inspector:*:*:*:*:*:*:*:*

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