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CVE-2026-109430 – Unauthenticated XXE Injection – Ellucian WebAdvisor 3.2 and earlier

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Summary

CVE-2026-109430 is an unauthenticated XML External Entity (XXE) injection vulnerability (CWE-611) in Ellucian WebAdvisor. A remote attacker can send a crafted XML POST request to the WebAdvisor endpoint to trigger server-side request forgery, NTLMv2 hash disclosure and arbitrary file reads. It is rated High (CVSS v4.0 base score 8.7), and the product has been end-of-support since June 2022.

Technical details

  • Root cause: Improper restriction of XML external entity references (CWE-611) when the application processes XML submitted to /WebAdvisor/WebAdvisor.
  • Trigger conditions: No authentication or user interaction is required. The attacker only needs network access to the endpoint.
  • Attack vector: A malicious XML document with external entity definitions is sent in an HTTP POST request to /WebAdvisor/WebAdvisor.
  • Impact:
    • Server-side request forgery (SSRF).
    • Disclosure of NTLMv2 authentication hashes through attacker-controlled SMB shares.
    • Arbitrary file reads from the underlying Windows host through error-based channels.

Affected software

  • Ellucian WebAdvisor 3.2 (CVE record).
  • Ellucian WebAdvisor 3.2 and earlier (VulnCheck advisory).
  • WebAdvisor reached end-of-support in June 2022.

Severity

  • CVSS v4.0: 8.7 (High), CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
  • CVSS v3.1: 7.5 (High), CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Mitigation and recommended actions

  • Immediate: No patch is documented, because the product is end-of-support. The advisory recommends migrating to Ellucian Colleague Self-Service.
  • Until migration is complete: Restrict network access to WebAdvisor, for example by removing internet exposure or limiting access to trusted networks. Also consider blocking outbound SMB (TCP 445) from the host so NTLMv2 hashes cannot be leaked. These are general hardening measures, not vendor-published workarounds.
  • Review web server logs for unexpected POST requests to /WebAdvisor/WebAdvisor that contain XML with DOCTYPE or ENTITY declarations.

Credit: Victor A. Morales and Marisabel Bachour (GM Sectec, Corp.).

References

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