CVE-2025-64515: open forms Input Validation Flaw — Fix

Description

Open Forms allows users create and publish smart forms. Prior to versions 3.2.7 and 3.3.3, forms where the prefill data fields are dynamically set to readonly/disabled can be modified by malicious users deliberately trying to modify data they're not supposed to. For regular users, the form fields are marked as readonly and cannot be modified through the user interface. This issue has been patched in versions 3.2.7 and 3.3.3.

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CVSS v3.1 Score

4.3

MEDIUM

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

Weakness Type (CWE)

CWE-20 Improper Input Validation

Affected Products

Vendor	Product	Versions
maykinmedia	open_forms	< 3.2.7
maykinmedia	open_forms	3.3.0 — 3.3.3

References

Advisories & Patches

https://github.com/open-formulieren/open-forms/security/advisories/GHSA-cp63-63mq-5wvf

Other References

https://github.com/open-formulieren/open-forms/blob/bcf2dc54c695fb7c8c58712627d82c4b766248b6/CHANGELOG.rst#327-2025-11-18 https://github.com/open-formulieren/open-forms/blob/bcf2dc54c695fb7c8c58712627d82c4b766248b6/CHANGELOG.rst#333-2025-11-18

Frequently Asked Questions

What is CVE-2025-64515? +

Open Forms allows users create and publish smart forms. Prior to versions 3.2.7 and 3.3.3, forms where the prefill data fields are dynamically set to readonly/disabled can be modified by malicious users deliberately trying to modify data they're not supposed to. For regular users, the form fields are marked as readonly and cannot be modified through the user interface. This issue has been patched in versions 3.2.7 and 3.3.3. It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2025-64515? +

CVE-2025-64515 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-64515? +

CVE-2025-64515 affects products from maykinmedia, specifically: open_forms. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-64515? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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