What’s Vulnerable › Vulnerabilities

CVE-2025-64515: Open Forms prefill data in read-only components can be tampered

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-11-18 · updated 2026-10-18
• Weakness: CWE-20

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.

Affected products

• open-formulieren open-forms: before 3.2.7; from 3.3.0 before 3.3.3 — fixed in 3.2.7, 3.3.3

How to fix

Upgrade to a fixed version: open-formulieren open-forms 3.2.7, 3.3.3. Check the vendor advisory for mitigations.

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

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