CVE-2025-62738 is a vulnerability identified in mmattax Formstack Online Forms, specifically affecting versions up to 2.0.2. The root cause is a missing authorization control, meaning the application fails to properly verify whether a user has the necessary permissions before allowing access to certain form management functions. This incorrect access control configuration allows unauthenticated remote attackers to perform unauthorized actions such as modifying form data or settings without any authentication or user interaction. The vulnerability is exploitable over the network (AV:N) with low attack complexity (AC:L), no privileges required (PR:N), and no user interaction needed (UI:N). The impact is limited to integrity (I:L) with no confidentiality (C:N) or availability (A:N) loss. Although no known exploits are currently reported in the wild, the flaw represents a significant risk for organizations relying on Formstack Online Forms for critical data collection and processing. The lack of patches at the time of disclosure necessitates immediate compensating controls to prevent exploitation. The vulnerability was reserved and published in late 2025, indicating recent discovery and disclosure.

For European organizations, this vulnerability could lead to unauthorized modification of form data or configurations, potentially undermining data integrity and trustworthiness of collected information. This is particularly critical for sectors such as finance, healthcare, government, and legal services, where form data often contains sensitive or regulated information. Although confidentiality and availability are not directly impacted, the integrity breach could result in fraudulent submissions, data corruption, or manipulation of workflows dependent on form data. This could lead to compliance violations under GDPR or other data protection regulations if inaccurate data is processed or decisions are made based on tampered inputs. Additionally, reputational damage and operational disruptions could arise from exploitation. The lack of authentication requirement and ease of exploitation increase the risk profile, making it a relevant threat for organizations using Formstack Online Forms in Europe.

1. Immediately review and restrict access control settings within Formstack Online Forms to ensure only authorized users can modify forms or access sensitive data. 2. Implement network-level controls such as IP whitelisting or VPN access to limit exposure of the Formstack management interfaces. 3. Monitor logs and form activity for unusual or unauthorized changes to detect potential exploitation attempts early. 4. Engage with the vendor (mmattax) to obtain patches or updates addressing this vulnerability as soon as they become available. 5. Consider temporary disabling or limiting the use of vulnerable Formstack Online Forms instances until a fix is applied. 6. Educate staff on the risks of unauthorized form modifications and establish incident response procedures for suspected exploitation. 7. Where possible, implement multi-factor authentication and role-based access controls to strengthen authorization mechanisms. 8. Conduct regular security assessments and penetration tests focusing on access control weaknesses in form management systems.