CVE-2026-47960: ColdFusion XXE Vulnerability Allows Arbitrary File Read

Technical summary

CVE-2026-47960 is an Improper Restriction of XML External Entity Reference vulnerability (CWE-611) in ColdFusion. The flaw stems from inadequate validation of XML input, permitting attackers to craft malicious XML documents that reference external entities. When a ColdFusion application processes such a document, it resolves the external entity reference and returns file contents to the attacker. The CVSS 3.1 vector (7.4 HIGH, AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N) reflects network-accessible exploitation, no special privileges required, user interaction as a necessary precondition, cross-boundary scope change, and high confidentiality impact with no integrity or availability compromise.

Business impact

Exploitation of this XXE vulnerability could result in unauthorized disclosure of sensitive application data, configuration files, credentials, or proprietary information stored on affected ColdFusion servers. For organizations relying on ColdFusion for customer-facing or data-processing applications, this represents a material data breach risk. The social engineering requirement (malicious file delivery) makes this particularly relevant to organizations where employees handle untrusted file uploads or external document processing. Data exposure could lead to compliance violations, reputational damage, and regulatory penalties depending on industry and data classification.

Affected systems

Adobe ColdFusion versions 2023.19, 2025.8 and earlier are vulnerable. This encompasses multiple ColdFusion release branches across both recent and legacy versions. Organizations should identify all deployed ColdFusion instances and cross-reference their version numbers against these affected ranges to determine exposure scope.

Exploitability

The vulnerability requires user interaction—a victim must open or process a malicious XML file within ColdFusion. There is no network-based unauthenticated remote code execution path. Exploitability depends on social engineering or file upload mechanisms within an organization's workflows. The attack surface is meaningful for organizations that accept XML uploads, process XML documents via web forms, or share files through internal systems. However, the user-interaction requirement provides a defensive control opportunity: user awareness and file validation policies can significantly reduce practical risk.

Remediation

Upgrade affected ColdFusion installations to a patched version released by Adobe. Adobe typically publishes patches in security bulletins; verify the exact patched version numbers against the official Adobe ColdFusion security advisory. Interim mitigations include disabling XML external entity processing where possible, restricting file upload capabilities to trusted sources, implementing XML input validation and schema enforcement, and educating users on phishing and malicious file risks.

Patch guidance

Contact Adobe or consult the Adobe ColdFusion Security Bulletin for definitive patch version information for your release branch. Patched versions should be tested in a non-production environment before production deployment to ensure application compatibility. Consider coordinating patches across your ColdFusion estate to maintain consistency and simplify future vulnerability management.

Detection guidance

Monitor ColdFusion application logs for XML parsing errors, unusual file access patterns, or XXE-related error messages. Network detection can focus on outbound connections from ColdFusion servers to unexpected external systems (a sign of blind XXE exfiltration). Endpoint detection should flag file access to sensitive system locations (e.g., /etc/passwd, configuration directories) initiated by ColdFusion processes. Web application firewalls can be configured to block or alert on suspicious XML payloads containing entity declarations or external references.

Why prioritize this

This vulnerability merits near-term patching due to its HIGH CVSS score (7.4), the prevalence of ColdFusion in enterprise environments, and the sensitivity of data at risk. While user interaction is required, many organizations handle file uploads or document processing workflows where an attacker could inject a malicious file. The cross-boundary scope change elevates impact beyond the application itself. Prioritize patching systems processing untrusted XML or handling sensitive data.

Risk score, explained

The CVSS 3.1 score of 7.4 (HIGH) reflects a network-accessible vulnerability requiring no privileges, with high confidentiality impact and cross-scope implications, tempered only by the need for user interaction. The score appropriately signals that this is a material risk requiring swift remediation, though not an immediate zero-day panic scenario given the social engineering component.

Frequently asked questions