CVE-2026-109332 Network-AI before 5.15.2 CORS Origin Validation Error in MCP SSE Transport
An attacker can bypass CORS restrictions to read unauthenticated endpoints if the server binds to a non-loopback address.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-109332?
CVE-2026-109332 is a low-severity vulnerability in Jovancoding Network-AI, published on 12 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-346
Which versions are affected by CVE-2026-109332?
How do I fix CVE-2026-109332?
No fix has been published for CVE-2026-109332 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-109332 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-109332 exists.
Sources
Also known as GHSA-4pvg-m42h-c3x2, GHSA-pfmh-9x5p-7vh5.