REC in MCPJam inspector due to HTTP Endpoint exposes
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-306.
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| MCPJam | inspector | up to 1.4.2 | — | No fix listed | CNA |
| — | @mcpjam/inspector (npm) | before 1.4.3 | 1.4.3 | Patch available | GHSA-232v-j27c-5pp6 |
- inspector VendorMCPJam Affected up to 1.4.2 Fixed in — No fix listed CNA
- @mcpjam/inspector (npm) Vendor— Affected before 1.4.3 Fixed in 1.4.3 Patch available GHSA-232v-j27c-5pp6
Remediation
- Fix · GHSA-232v-j27c-5pp6 @mcpjam/inspector (npm) Fixed in 1.4.3 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-23744
- 2026-10-03 Alias added: GHSA-232v-j27c-5pp6
References
Sources
- CVE-2026-23744 · CVE Program
- CVE-2026-23744 · NVD
- FIRST EPSS
- GHSA-232v-j27c-5pp6 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences