CVE-2026-49464

NL Portal: IDOR allows any authenticated user to complete and tamper with another user's taak

Published Sep 11, 2026 CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Description
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

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-6h3c-r723-7fx3 NL Portal: IDOR allows any authenticated user to complete and tamper with another user's taak
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Nl-portal
Nl-portal nl-portal-backend-libraries
Vendors & Products Nl-portal
Nl-portal nl-portal-backend-libraries
Type Values Removed Values Added
Description 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
Title NL Portal: IDOR allows any authenticated user to complete and tamper with another user's taak
Weaknesses CWE-639
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Sep 15, 2026, 4:36 PM
Reserved
May 30, 2026, 4:17 AM
Status
Deferred
Published
Sep 11, 2026, 9:17 PM
Modified
Sep 30, 2026, 5:51 PM