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Vulnerability record · CVE-2026-109332 · published 12 October 2026

CVE-2026-109332: Origin validation error vulnerability

Network-AI (npm network-ai) before 5.15.2 contains an origin validation error in McpSseServer._handleRequest in lib/mcp-transport-sse.ts that reflects localhost Origins into Access-Control-Allow-Origin regardless of bind interface. When the server binds a non-loopback address, an attacker page with a localhost Origin visited by a victim can read unauthenticated endpoints like /health cross-origin.

2.3 CVSS 4.0 Low EPSS 0.12% · top 98.3% CWE-346 · Origin validation error Deferred
2.3CVSS 4.0 base score
0.12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
15 Oct 2026Last modified by NVD

Description

Network-AI (npm network-ai) before 5.15.2 contains an origin validation error in McpSseServer._handleRequest in lib/mcp-transport-sse.ts that reflects localhost Origins into Access-Control-Allow-Origin regardless of bind interface. When the server binds a non-loopback address, an attacker page with a localhost Origin visited by a victim can read unauthenticated endpoints like /health cross-origin.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/Jovancoding/Network-AI/security/advisories/GHSA-4pvg-m42h-c3x2
https://www.vulncheck.com/advisories/network-ai-before-5.15.2-cors-origin-validation-error-in-mcp-sse-transport
https://github.com/Jovancoding/Network-AI/security/advisories/GHSA-4pvg-m42h-c3x2

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Source: NIST National Vulnerability Database (record CVE-2026-109332), CISA KEV, FIRST EPSS (scores of 2026-10-16). This page is refreshed as NVD updates the record.