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NL Portal Taak (Vulnerable: >= 1.5.0, <= 3.0.0)

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high advisory

NL Portal IDOR Vulnerability Allows Tampering and Data Leakage of Other Users' Tasks (CVE-2026-49464)

An Insecure Direct Object Reference (IDOR) vulnerability, CVE-2026-49464, in NL Portal's Taak V2 implementation (versions 1.5.0 through 3.0.0) allows authenticated attackers to mark other users' tasks as complete, overwrite submitted data, and leak personal information by exploiting an authorization bypass in the `submitTaakV2` GraphQL endpoint.

NL Portal Taak idor graphql data-tampering data-leakage authentication-bypass cve
2t