CVE-2026-23744 (GCVE-0-2026-23744)

Vulnerability from cvelistv5 – Published: 2026-01-16 20:10 – Updated: 2026-01-16 21:15
VLAI Shadowserver KEVIntel
Title
REC in MCPJam inspector due to HTTP Endpoint exposes
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-306 - Missing Authentication for Critical Function
Assigner
References
Impacted products
Vendor Product Version
MCPJam inspector Affected: <= 1.4.2
Create a notification for this product.
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 8880d6f5-3bbe-4752-802c-e54bc0869525

Vulnerability ID: CVE-2026-23744

Status: Confirmed

Status Updated: 2026-07-12 00:00 UTC

Exploited: Yes

Characteristics
Severity: 0.0
Timestamps
First Seen: 2026-03-07
Asserted: 2026-03-07
Last Seen: 2026-07-12
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: MCPJam / MCPJam Inspector | Class: ai-system | Severity: None (CVSS 0) | IoT: no | In CISA KEV: no | Honeypot connections on 2026-07-12: 17
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 1
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class ai-system
7D Avg 0
Vendor MCPJam
30D Avg 1
90D Avg 1
Product MCPJam Inspector
Cisa Kev no
Connections 17
Observation Date 2026-07-12
Vulnerability Class CVSS
Vulnerability Score 0
Vulnerability Severity None
References
Created: 2026-06-30 09:22 UTC | Updated: 2026-07-14 01:01 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: bd9ab519-87f7-4ff3-8dde-ccdbf828d03c

Vulnerability ID: CVE-2026-23744

Status: Confirmed

Status Updated: 2026-04-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-04-03
Asserted: 2026-04-03
Scope
Notes: KEVIntel entry: REC in MCPJam inspector due to HTTP Endpoint exposes | Affected: MCPJam / inspector | CVSS: 9.8 (CRITICAL) | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title REC in MCPJam inspector due to HTTP Endpoint exposes
Vendor MCPJam
Product inspector
Added Date 2026-04-03T00:00:00.000Z
Cvss Score 9.8
Epss Score None
Cvss Severity CRITICAL
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-06-23 14:03 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.