CVE-2026-106616 in ColdFusion
Summary
by MITRE • 10/14/2026
ColdFusion is affected by an Improper Restriction of XML External Entity Reference ('XXE') vulnerability that could lead to arbitrary file system read. An attacker could exploit this vulnerability to access sensitive files and directories outside the intended access scope. Exploitation of this issue does not require user interaction. Scope is changed.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 10/14/2026
Adobe ColdFusion contains a critical security flaw classified as an Improper Restriction of XML External Entity Reference, commonly known as XXE. This vulnerability stems from the application's failure to properly validate or sanitize external entity declarations within processed XML documents. In standard XML processing, entities allow for the inclusion of external resources, such as files or network endpoints, into a document. When an application like ColdFusion processes user-supplied or untrusted XML input without strict restrictions on these external references, it inadvertently permits attackers to define malicious entities that point to local system paths. This architectural oversight allows the underlying parser to resolve and read arbitrary files from the server's file system, effectively bypassing intended access controls and exposing sensitive data stored outside the application's designated scope.
The technical mechanism behind this exploitation involves crafting a specially formatted XML payload containing an external entity declaration that references a local path on the host operating system. For instance, an attacker might define an entity pointing to files such as /etc/passwd on Linux systems or C:\Windows\system32\drivers\etc\hosts on Windows environments. When ColdFusion processes this input, it resolves the entity and includes its contents in the output response or internal processing logic. Since this process does not require user interaction beyond sending a single HTTP request with the malicious XML payload, the attack vector is highly efficient and automated-friendly. The scope of impact changes from affecting only specific application data to encompassing the entire server environment, as the attacker gains read access to any file accessible by the ColdFusion service account.
The operational impact of this vulnerability is severe, potentially leading to complete system compromise if combined with other techniques or if sensitive configuration files are exposed. Access to critical system files can reveal database credentials, API keys, internal network configurations, and user data stored in plaintext or weakly encrypted formats. This information serves as a foundation for further attacks, including privilege escalation, lateral movement within the network, and persistent backdoor installation. The lack of required user interaction significantly lowers the barrier to entry for attackers, allowing automated scanning tools to rapidly identify and exploit vulnerable instances across large networks. Consequently, this vulnerability poses an immediate threat to data confidentiality and integrity, undermining trust in the ColdFusion platform's ability to handle untrusted input securely.
To mitigate this risk, administrators must ensure that Adobe ColdFusion is updated to a version where this XXE flaw has been patched by applying the latest security updates provided by Adobe. In environments where immediate patching is not feasible, implementing strict XML parsing configurations can provide temporary relief. This includes disabling external entity processing entirely or configuring the parser to only allow whitelisted entities and protocols. Additionally, deploying Web Application Firewalls (WAFs) with rules specifically designed to detect and block XXE payloads can help mitigate exploitation attempts at the network perimeter. Regular security audits and input validation practices should be enforced to ensure that all XML inputs are rigorously sanitized before processing.
From a classification perspective, this vulnerability aligns with CWE-611, which defines Improper Restriction of XML External Entity Reference. It also maps to MITRE ATT&CK technique T1059.007, specifically Command and Scripting Interpreter via XML parsing, although the primary outcome here is information disclosure rather than direct command execution. Understanding these mappings helps security teams prioritize remediation efforts based on industry-standard risk frameworks. The incident underscores the importance of secure coding practices regarding XML processing in enterprise applications, particularly when handling data from untrusted sources. Organizations must remain vigilant against such input validation failures to maintain robust defense-in-depth strategies and protect sensitive infrastructure assets from unauthorized access.