CVE-2025-64515Network attack vector

Prefill data tampering via skipped logic evaluation

Published Nov 18, 2025 · Updated Nov 19, 2025

Improper input validation in Open Formulieren Open Forms allows remote authenticated users to alter dynamically read-only prefill data. Final step-data validation checks static disabled flags without first evaluating form logic, so crafted API requests can overwrite protected values. Affected releases are before 3.2.7 and 3.3.0 through 3.3.2; exploitation requires conditional read-only logic and changes submitted values only.

CVSS severity4.3
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Open Formulieren Open Forms allows remote authenticated users to alter dynamically read-only prefill data. Final step-data validation checks static disabled flags without first evaluating form logic, so crafted API requests can overwrite protected values. Affected releases are before 3.2.7 and 3.3.0 through 3.3.2; exploitation requires conditional read-only logic and changes submitted values only.

The record

CVE
CVE-2025-64515
Published
Nov 18, 2025
Updated
Nov 19, 2025
Vendor
Open Formulieren
Product
Open Forms
Classifications
CWE-20, T1565.002
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 19, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.2.7
  2. Affected versionversion=>= 3.3.0, < 3.3.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open Formulieren · Open Formsversion=< 3.2.7; version=>= 3.3.0, < 3.3.3

Published CVSS scores

4.3GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1565.002Transmitted Data Manipulation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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