CVE-2026-49464 — NL Portal: IDOR allows any authenticated user to complete and tamper with another user's taak

Description (CNA)

NL Portal Backend Libraries provide backend components for Dutch government portals that interact with residents, customers, suppliers, and partner organizations. The `nl.nl-portal:taak` package from version 1.5.0 through 3.0.0 fails to verify ownership when processing the `submitTaakV2` GraphQL mutation, allowing an authenticated user who knows or guesses another user’s task ID to read its form data, overwrite its submitted data, and mark the task as completed. Version 3.0.1 contains a patch. As a workaround, block the `submitTaakV2` mutation at the API gateway or restrict the `/graphql` endpoint to trusted networks

Affected (CNA)

Vendor / product	Versions
nl-portal / nl-portal-backend-libraries	affected >= 1.5.0, < 3.0.1

CWE

CWE-639

References

https://github.com/nl-portal/nl-portal-backend-libraries/security/advisories/GHSA-6h3c-r723-7fx3

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.