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CVE PROGRAM SOURCE RECORD6.5 Medium

CVE-2026-28803

Open Forms possible to view submission details of other people than intended

Description

Open Forms allows users create and publish smart forms. Prior to 3.3.13 and 3.4.5, to be able to cosign, the cosigner receives an e-mail with instructions or a deep-link to start the cosign flow. The submission reference is communicated so that the user can retrieve the submission to be cosigned. Attackers can guess a code or modify the received code to look up arbitrary submissions, after logging in (with DigiD/eHerkenning/... depending on form configuration). This vulnerability is fixed in 3.3.13 and 3.4.5.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

open-formulieren open-forms

  • >= 3.4.0-alpha.0, < 3.4.5affected
  • < 3.3.13affected

References