CVE-2026-47930: Adobe ColdFusion Input Validation Bypass

Technical summary

CVE-2026-47930 is an improper input validation vulnerability (CWE-20) in Adobe ColdFusion that enables a security feature bypass. The root cause is insufficient validation of user-supplied input, allowing a low-privileged, authenticated attacker to circumvent access controls. The vulnerability has a CVSS v3.1 score of 8.1 (HIGH) with a network attack vector, low attack complexity, and no user interaction required. It results in both confidentiality and integrity compromise (reading and writing unauthorized data) while maintaining availability. Affected versions include ColdFusion 2023.19, 2025.8, and earlier releases within those branches.

Business impact

This vulnerability creates a privilege escalation pathway within ColdFusion deployments. An employee, contractor, or compromised account with basic system access could extract sensitive data—customer records, intellectual property, configuration secrets—or modify application logic and data without authorization. For organizations relying on ColdFusion for mission-critical applications or data handling, this gap undermines role-based access control assumptions and could trigger compliance violations (HIPAA, PCI-DSS, SOC 2) if customer or payment data is exposed or altered. Incident response and breach notification costs may follow if exploitation occurs.

Affected systems

Adobe ColdFusion versions 2023.19, 2025.8, and all earlier versions within those release lines are vulnerable. Organizations running current or recent ColdFusion instances should treat this as directly applicable. Older versions (2021 and earlier) and versions newer than 2025.8 may also be in scope—verify against Adobe's official advisory for the complete version matrix. ColdFusion deployments range from small departmental applications to large enterprise integration platforms, so the exposure footprint varies widely by organization.

Exploitability

Exploitation is straightforward for an attacker with valid low-privilege credentials. No user interaction is required, and no complex attack chain is needed. The network-accessible nature (AV:N in CVSS) means an attacker can trigger the vulnerability remotely if they have authentication credentials. This is currently not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, but the low barrier to entry and high impact make it attractive once proof-of-concept code circulates in security communities. Assume active exploitation will occur within weeks of public disclosure if patches remain undeployed.

Remediation

Apply the security update from Adobe as soon as it becomes available for your version of ColdFusion. Adobe typically releases patches on its regular security update schedule. Until patching is complete, apply the principle of least privilege rigorously: audit and minimize the number of users with any ColdFusion application access, enforce multi-factor authentication for administrative accounts, and monitor for suspicious data access patterns or configuration changes. Network segmentation (restricting ColdFusion application access to trusted internal subnets) can reduce attack surface while patches are being staged.

Patch guidance

Monitor Adobe's security advisory portal and ColdFusion product security page for official patch releases. When available, patches will be released for the 2023 and 2025 branches. Prioritize testing patches in a non-production environment first, especially for ColdFusion instances that are integrated with critical business systems or databases. Given the HIGH severity and the ease of exploitation by an authenticated user, patch deployment should be completed within 2–4 weeks of patch availability. If your ColdFusion version is no longer in mainstream support, consider upgrading to a current supported release to ensure timely access to security updates.

Detection guidance

Monitor ColdFusion application logs for unusual data access requests from low-privilege user accounts—particularly reads or writes to sensitive tables or configuration endpoints that deviate from normal patterns. Endpoint Detection and Response (EDR) tools should flag unexpected privilege escalation or lateral movement originating from ColdFusion application processes. Network intrusion detection systems (IDS) may observe attempts to manipulate input in specific ColdFusion application parameters; correlate these with authentication logs. Query database audit logs for unauthorized modifications tied to ColdFusion service accounts or users accessing ColdFusion applications. If feasible, enable input validation logging at the application layer to capture rejected or suspicious payloads.

Why prioritize this

This vulnerability merits immediate prioritization because it combines high impact (confidentiality and integrity compromise), ease of exploitation (low privileges, no user interaction), and broad applicability across ColdFusion installations. The recent publication date and the fact that it affects current product versions (2025.8) mean that many organizations are likely running vulnerable code. The lack of KEV status does not diminish urgency; public proof-of-concept development is likely forthcoming, and authenticated attackers (insiders, compromised accounts) can exploit this without sophisticated tools. Organizations with ColdFusion should treat patch deployment as critical and not defer to a later maintenance window.

Risk score, explained

The CVSS 8.1 HIGH score reflects a network-accessible vulnerability requiring only low authentication and resulting in both confidentiality and integrity loss. The attack complexity is low, indicating that no special conditions or user interaction is needed. While availability is not affected, the combination of remote accessibility and the ability to read and alter data makes this a significant risk. The lack of an availability impact (AV prevents a perfect 9.0+ score) is a minor mercy; the threat to data protection and system integrity remains acute. Organizations should treat this as equivalent to or higher than the CVSS score suggests if they store sensitive data in ColdFusion-backed databases or rely on ColdFusion for mission-critical logic.

Frequently asked questions