CVE-2026-28803

MEDIUM EPSS 10.1%
Published Mar 11, 20263mo ago · Modified Mar 17, 20263mo ago
6.5 CVSS 3.1
Medium
Find Similar
Published Mar 11, 2026 3mo ago
Last Modified Mar 17, 2026 3mo ago

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.

CVSS Details

Base Score
6.5
Exploitability
2.8
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability None

Threat Intelligence

EPSS Exploit Probability
10.1% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-284

Affected Products 2

VendorProductVersionRange
maykinmediaopen_forms* <3.3.13
maykinmediaopen_forms*≥3.4.0  –  <3.4.5

References 1

  • github.com https://github.com/open-formulieren/open-forms/security/advisories/GHSA-2g49-rfm6-5qj5
    MitigationVendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.