CVE-2026-49462 nl.nl-portal:app has GraphiQL UI and GraphQL schema introspection enabled by default
Unauthenticated access to GraphiQL and schema introspection allows attackers to map the API structure, facilitating further exploitation of the Dutch government portal backend.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-49462?
CVE-2026-49462 is a medium-severity vulnerability in nl.nl-portal:app, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
NL Portal Backend Libraries provide backend components for Dutch government portals that interact with residents, customers, suppliers, and partner organizations. In versions up to and including 3.0.0, deployments using the shipped default configuration exposed two GraphQL developer features without requiring authentication: the GraphiQL playground, an interactive UI for issuing GraphQL queries; and schema introspection, which lets a caller download the full description of every query, mutation, type, and argument the API supports. Anyone who could reach the `/graphiql` endpoint could open the playground in a browser, pull the full schema, and use that to map out the API and craft calls against it. By itself this does not leak user data, but it removes the guesswork from attacking the rest of the API and significantly lowers the bar for finding and exploiting other weaknesses. Version 3.0.1 patches the issue. As a workaround, override the two settings in deployed configuration.
Which versions are affected by CVE-2026-49462?
How do I fix CVE-2026-49462?
No fix has been published for CVE-2026-49462 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-49462 being exploited?
There is no known exploitation of CVE-2026-49462 in the wild and no public exploit code.
Sources
Also known as GHSA-9m9w-2vqr-m384.