Description

The XML and schema validation functionalities within the SchemaValidator Mediator process XML input as part of validation flows. Under certain conditions, the XML parser allows the resolution of external entities when handling user-supplied XML content during validation operations. This behavior can occur when an attacker supplies crafted XML payloads to the relevant mediator flows with sufficient privileges. Successful exploitation may allow a highly privileged actor to read files accessible within the server hosting the affected product. Additionally, it may be possible to trigger outbound requests to unintended internal or external locations, depending on the server environment and network configuration. Specially crafted XML payloads can also lead to excessive resource consumption during parsing, impacting the availability of the product.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.7",
  "pubDate": "2026-08-06T22:17:03.770Z",
  "pubdate": "2026-08-06T22:17:03.770Z",
  "executiveSummary": "The vulnerability resides within the XML and schema validation functionalities of the SchemaValidator Mediator, which improperly processes XML input during validation flows. This flaw constitutes an XML External Entity (XXE) injection vulnerability arising from insecure XML parser configurations that permit the resolution of external entities when handling untrusted, user-supplied XML content.\nSuccessful exploitation of this vulnerability empowers a highly privileged threat actor to achieve arbitrary local file read capabilities, accessing sensitive files accessible within the host server. Furthermore, depending on the network configuration and server environment, adversaries can trigger Server-Side Request Forgery (SSRF) via outbound requests to unintended internal or external network locations. Additionally, the processing of maliciously crafted XML payloads can induce excessive resource consumption, resulting in Denial of Service (DoS) and impacting product availability.\nExploitation requires the attacker to possess sufficient privileges to submit crafted XML payloads directly to the vulnerable mediator flows. The overall risk implication is severe due to potential confidentiality loss through unauthorized file disclosure, internal network exposure via SSRF, and availability degradation from resource exhaustion.",
  "technicalDetails": "The root cause of the vulnerability stems from insecurely configured XML parsers utilized by the SchemaValidator Mediator. During validation operations, the underlying XML processing engine fails to disable the resolution of external entities and DTDs (Document Type Definitions) when parsing user-supplied XML input.\nThe vulnerable component is explicitly the SchemaValidator Mediator and its integrated XML and schema validation functionalities. The vulnerability is triggered when the mediator processes untrusted XML content provided via validation flows.\nThe attack flow proceeds as follows: First, a highly privileged actor crafts a specialized XML payload containing malicious external entity definitions or XML entities designed to reference local files, initiate outbound HTTP requests, or induce recursive expansion (such as the Billion Laughs attack). Second, the attacker submits this crafted XML payload to the affected product's mediator flows. Third, the SchemaValidator Mediator passes the input to the insecurely configured XML parser. Fourth, the parser evaluates the external entities during the validation process. If configured for entity resolution, the parser attempts to retrieve the referenced resource from the local filesystem or via network protocols, or recursively expands the payload.\nPost-exploitation impacts are multifaceted. By leveraging external entity definitions pointing to local file paths (e.g., file:///etc/passwd), the attacker can exfiltrate sensitive system files in the response or error logs, contingent upon the application configuration. By referencing network locations (e.g., http://internal-server/), the attacker forces the hosting server to generate outbound requests, facilitating internal reconnaissance or SSRF attacks against segmented network resources. Finally, by supplying deeply nested or recursive XML structures, the parser consumes excessive CPU and memory resources, leading to severe resource exhaustion and application unavailability."
}