{"cve":"CVE-2026-49464","nvd":{"published":"2026-09-11T21:17:10.523","modified":"2026-09-30T17:51:56.193","status":"Deferred","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","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","score":8.1},"cwes":["CWE-639"],"references":["https://github.com/nl-portal/nl-portal-backend-libraries/security/advisories/GHSA-6h3c-r723-7fx3"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:53:43.293028046+00:00"},"epss":{"cve":"CVE-2026-49464","score":0.0035,"percentile":0.28329,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-6h3c-r723-7fx3","url":"https://osv.dev/vulnerability/GHSA-6h3c-r723-7fx3","summary":"NL Portal: IDOR allows any authenticated user to complete and tamper with another user's taak","modified":"2026-07-08T21:26:36.797535Z","packages":[{"ecosystem":"Maven","name":"nl.nl-portal:taak","purl":"pkg:maven/nl.nl-portal/taak","ranges":[">=1.5.0 <3.0.1"],"fixed":["3.0.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}