Description

IBM Business Automation Workflow containers and traditional may use programming model artifacts that are vulnerable to XML Entity Injection attacks by default.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.1",
  "pubDate": "2026-09-14T21:17:00.980Z",
  "pubdate": "2026-09-14T21:17:00.980Z",
  "executiveSummary": "IBM Business Automation Workflow (BAW) containers and traditional installations are susceptible to XML External Entity (XXE) injection vulnerabilities due to insecure default configurations in their programming model artifacts.\nThis vulnerability arises from the improper processing of untrusted XML input, where the underlying XML parser is configured to resolve external entities.\nSuccessful exploitation allows unauthorized actors to perform Server-Side Request Forgery (SSRF), access internal files from the host filesystem, or trigger a denial-of-service (DoS) condition via resource exhaustion (e.g., XML bomb).\nThe vulnerability affects both containerized and traditional deployments of IBM Business Automation Workflow. The risk is significant, as it can lead to the exposure of sensitive configuration files, internal network credentials, or service metadata.\nExploitation generally requires the attacker to submit a maliciously crafted XML payload to an endpoint that processes user-supplied XML data without adequate validation or parser hardening.\nThe risk implication is high, as it grants attackers the ability to bypass perimeter security controls to interact with internal resources or exfiltrate data from the execution environment.",
  "technicalDetails": "The root cause of this vulnerability lies in the default configuration of the XML parser used within IBM Business Automation Workflow programming model artifacts. By default, many XML parsers are configured to resolve external entities referenced within a Document Type Definition (DTD).\nAn XXE injection attack occurs when the XML parser processes a payload containing a DTD with a declared external entity that points to a URI or a local file path. The parser, operating with the privileges of the application, attempts to fetch or read the content at the specified location and replaces the entity reference with the retrieved data.\nThe attack flow typically initiates when an adversary sends a specially crafted POST request containing an XML document to a vulnerable service endpoint. The payload includes a DOCTYPE declaration defining an external entity, such as: <!ENTITY xxe SYSTEM 'file:///etc/passwd'>. When the server processes this XML input, the parser resolves the entity by accessing the target resource.\nIf the application is configured to reflect the parsed content back to the user or if the results of the parse trigger logic that can be inferred by the attacker, the contents of internal files can be exfiltrated. Even without direct output reflection, the attacker can leverage the mechanism to conduct out-of-band (OOB) data exfiltration or to probe internal network services, effectively using the application server as a proxy to reach assets otherwise protected by the network perimeter.\nFurthermore, the vulnerability can be leveraged for Denial of Service attacks by utilizing billion-laughs or XML bomb payloads, which result in exponential expansion of memory usage upon entity expansion, leading to severe resource degradation or service crashes.\nThe exposure extends to all components of IBM Business Automation Workflow that utilize these insecurely configured parsing artifacts. No specific authentication is inherently required to initiate the attack if the target endpoint is publicly exposed or accessible to the attacker within the network segment. The post-exploitation impact includes unauthorized sensitive file disclosure, internal service reconnaissance, and potential complete service compromise depending on the information stored within the local filesystem or accessible via the application's network context."
}