# 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.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Sep 2026
- **Updated:** 14 Sep 2026
- **Also known as:** GHSA-9m9w-2vqr-m384

## 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.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor), CWE-1188 (Initialization of a Resource with an Insecure Default)

## 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.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-49462 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-49462 in the wild and no public exploit code.

Affected product: nl.nl-portal:app. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-49462/ (Markdown: https://insights.sbomify.com/CVE-2026-49462/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-49462
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-49462
- OSV: https://osv.dev/vulnerability/CVE-2026-49462

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-49462/
Summaries are generated and may contain mistakes; the official description above is the record.