CVE-2026-28803 | THREATINT

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.

PUBLISHED Reserved 2026-03-03 | Published 2026-03-11 | Updated 2026-03-11 | Assigner GitHub_M

MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Problem types

CWE-284: Improper Access Control

Product status

>= 3.4.0-alpha.0, < 3.4.5

affected

< 3.3.13

affected

References

github.com/...-forms/security/advisories/GHSA-2g49-rfm6-5qj5

cve.org (CVE-2026-28803)

nvd.nist.gov (CVE-2026-28803)

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