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CVE-2026-28803— Open Forms possible to view submission details of other people than intended

Quick assessment

Affected
open-formulieren open-forms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Open Forms是Open Formulieren开源的一种智能动态表格。用于快速创建通过 API 公开的强大而智能的表单。 Open Forms 3.3.13之前版本和3.4.5之前版本存在访问控制错误漏洞，该漏洞源于攻击者可猜测或修改代码来查找任意提交，可能导致信息泄露。

CVSS 6.5 · Medium EPSS 0.20% · P10
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I. Basic Information for CVE-2026-28803

Vulnerability Information
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Vulnerability Title
Open Forms possible to view submission details of other people than intended
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Open Forms 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open Forms是Open Formulieren开源的一种智能动态表格。用于快速创建通过 API 公开的强大而智能的表单。 Open Forms 3.3.13之前版本和3.4.5之前版本存在访问控制错误漏洞，该漏洞源于攻击者可猜测或修改代码来查找任意提交，可能导致信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
open-formulieren open-forms >= 3.4.0-alpha.0, < 3.4.5 -

II. Public POCs for CVE-2026-28803

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III. Intelligence Information for CVE-2026-28803

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Vendor Advisories for CVE-2026-28803 (1)

IV. Related Vulnerabilities

Same product: open-forms
Same vendor: open-formulieren
Same weakness: CWE-284

V. Comments for CVE-2026-28803

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