# CVE-2026-49462: NL Portal Backend Libraries GraphQL schema exposure

Source: https://junglewise.ai/threats/cve-2026-49462-nl-portal-backend-libraries-graphql-schema-exposure  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-11. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-49462 · Severity: medium · CVSS 5.3 · Published 2026-09-11

NL Portal Backend Libraries provide the backend infrastructure for Dutch government portals that serve residents, businesses, and partner organizations. Versions up to 3.0.0 exposed the GraphQL developer interface and full API schema without requiring authentication, allowing anyone who could access the endpoint to download a complete map of the API's capabilities and structure. While this alone does not leak user data, it dramatically simplifies attacks against other API vulnerabilities and eliminates the effort required to discover exploitable weaknesses.

Technologies: [NL Portal Backend Libraries](https://junglewise.ai/threats/technologies/nl-portal-backend-libraries). Vendors: [NL Portal](https://junglewise.ai/threats/vendors/nl-portal).

## Quick answers

**Is CVE-2026-49462 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-49462 being exploited in the wild.

**How severe is CVE-2026-49462?** Medium severity, with a CVSS score of 5.3, published 11 September 2026.

**Which products and versions are affected?** NL Portal Backend Libraries up to and including 3.0.0.

**Is there a fix for CVE-2026-49462?** A patch was published on 2026-09-11: Version 3.0.1 released with CVE-2026-49462 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-49462 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-49462?** Check whether you run NL Portal Backend Libraries at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an information disclosure flaw affecting GraphQL-based APIs. The root cause is the shipped default configuration enabling the GraphiQL interactive UI (at `/graphiql`) and GraphQL schema introspection without authentication enforcement. An unauthenticated attacker on the network can reach the endpoint, use the UI to issue arbitrary GraphQL queries, and retrieve the full schema via introspection queries (`__schema`, `__type`), which reveals every query, mutation, type, and field the API supports. The vulnerability existed since version 1.5.x under Expedia GraphQL Kotlin (using `graphql.playground.enabled: true`) and continued in 3.0.x after migration to Spring GraphQL (using `spring.graphql.graphiql.enabled: true` with introspection also enabled by default). Version 3.0.1 patches the issue by disabling both settings in the default configuration; workarounds for unpatched versions include configuration overrides or API gateway-level blocking of the UI endpoint and introspection queries.

## Affected products

- NL Portal Backend Libraries up to and including 3.0.0

## Timeline

- 2026-06-03: disclosed: GHSA-9m9w-2vqr-m384 published
- 2026-05: other: Discovered during penetration testing engagement (phase 1)
- 2026-09-11: patched: Version 3.0.1 released with CVE-2026-49462

## References

- [https://github.com/nl-portal/nl-portal-backend-libraries/commit/0d2af7665a737e91565352bd4e6124cacaa853b7](https://github.com/nl-portal/nl-portal-backend-libraries/commit/0d2af7665a737e91565352bd4e6124cacaa853b7)
- [https://github.com/nl-portal/nl-portal-backend-libraries/security/advisories/GHSA-9m9w-2vqr-m384](https://github.com/nl-portal/nl-portal-backend-libraries/security/advisories/GHSA-9m9w-2vqr-m384)