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medium advisory

CVE-2026-3603: IBM Engineering Lifecycle Management XXE Vulnerability

IBM Engineering Lifecycle Management 7.0.3, 7.1.0, and 7.2.0 are vulnerable to XML external entity injection (XXE), allowing an authenticated attacker to expose sensitive information or consume memory resources.

IBM Engineering Lifecycle Management (ELM) versions 7.0.3 Interim Fix 001 through Interim Fix 021, 7.1.0 Interim Fix 001 through Interim Fix 009, and 7.2.0 and 7.2.0 Interim Fix 001 are susceptible to an XML external entity (XXE) injection vulnerability, tracked as CVE-2026-3603. An authenticated attacker can exploit this flaw by injecting malicious XML data during processing. Successful exploitation could lead to sensitive information disclosure, such as reading arbitrary files on the server, or denial-of-service conditions due to excessive memory consumption. This vulnerability impacts organizations utilizing vulnerable versions of IBM ELM, potentially leading to data breaches and service disruptions.

Attack Chain

  1. An attacker authenticates to the IBM Engineering Lifecycle Management application.
  2. The attacker crafts a malicious XML payload containing an external entity declaration.
  3. The attacker submits the crafted XML data to an endpoint that processes XML data.
  4. The application parses the XML data without proper sanitization of external entities.
  5. The XML parser attempts to resolve the external entity, potentially accessing local files or external resources.
  6. If the external entity points to a local file, the file’s contents are disclosed to the attacker.
  7. If the external entity leads to an external resource, it may trigger a denial-of-service condition due to excessive resource consumption.

Impact

Successful exploitation of CVE-2026-3603 can lead to the exposure of sensitive information stored on the IBM Engineering Lifecycle Management server, such as configuration files, user credentials, or proprietary data. The vulnerability can also lead to denial-of-service conditions if the injected XML payload causes excessive memory consumption. This can impact the availability of the ELM application, disrupting business operations.

Recommendation

  • Apply the security patch or upgrade to a non-vulnerable version of IBM Engineering Lifecycle Management as recommended by IBM. See https://www.ibm.com/support/pages/node/7274078.
  • Deploy the following Sigma rule to detect potential XXE attacks targeting IBM Engineering Lifecycle Management based on HTTP request patterns.
  • Implement input validation and sanitization for all XML data processed by IBM Engineering Lifecycle Management to prevent XXE attacks.
  • Monitor web server logs for suspicious XML requests containing external entity declarations and unusual file access patterns.

Detection coverage 2

Detects CVE-2026-3603 Exploitation — Suspicious XML Entity Declaration in HTTP Request

medium

Detects CVE-2026-3603 exploitation — HTTP request containing XML entity declaration, indicative of potential XXE attack.

sigma tactics: initial_access techniques: T1190 sources: webserver

Detects CVE-2026-3603 Exploitation — Suspicious XML External Entity File Access

medium

Detects CVE-2026-3603 exploitation — Access to sensitive files via XML External Entity injection

sigma tactics: initial_access techniques: T1190 sources: webserver

Detection queries are available on the platform. Get full rules →