CVE-2026-23744
CriticalExploitedPublic exploitREC in MCPJam inspector due to HTTP Endpoint exposes
Published Jan 16, 2026 · Updated Aug 12, 2026 · Also known as GHSA-232v-j27c-5pp6
Key Facts
Patch immediately- CVE-2026-23744 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Inspector (Mcpjam), @mcpjam/inspector (npm).
- It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Feb 18, 2026. Public exploit code is available.
- EPSS estimates a 68% probability of exploitation in the next 30 days.
- Fixed versions are available, including @mcpjam/inspector 1.4.3, Inspector 1.4.3.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
68%
Higher than 99.3% of all scored CVEs
Exploited in the wild
Yes
2 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-23744 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Feb 18, 2026 | n/a | Not reported |
| CIRCL KEV | Mar 7, 2026 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| InspectorMcpjam | >= <= 1.4.2 | 1.4.3 |
| @mcpjam/inspectornpm | See advisory | 1.4.3 |
Patched Releases
@mcpjam/inspector
1.4.3
Inspector
1.4.3
Timeline
Publicly disclosed
Jan 16, 2026
Added to Industry KEV feed
Feb 18, 2026
Added to CIRCL KEV
Mar 7, 2026
Last updated
Aug 12, 2026
Weakness Type
- CWE-306 Missing Authentication for Critical Function
References
- advisoryGHSA advisory
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23744.json
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-23744
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
MCPJam inspector is the local-first development platform for MCP servers.
Affected: Inspector (Mcpjam) versions >= <= 1.4.2; @mcpjam/inspector (npm). The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Feb 18, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including @mcpjam/inspector 1.4.3, Inspector 1.4.3.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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