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CVE-2026-49464 is an insecure direct object reference (IDOR) vulnerability in the NL Portal taak component. According to the provided advisory, the flaw allows any authenticated user to complete and tamper with another user's task and to view previously entered form data. The issue affects task submission handling in the submitTaakV2 GraphQL mutation, where authorization was not properly enforced before processing task submission requests. As a result, an authenticated user could reference another user's task object and interact with it without sufficient access control validation.
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