CVE-2026-109430 in WebAdvisor
Summary
by MITRE • 10/15/2026
Ellucian WebAdvisor 3.2 contains an unauthenticated XML External Entity (XXE) injection vulnerability that allows remote attackers to submit crafted XML POST requests to the /WebAdvisor/WebAdvisor endpoint without disabling external entity and DTD resolution. Attackers can exploit this flaw to force the server into SSRF requests, coerce NTLMv2 hash disclosure via attacker-controlled SMB shares, and read arbitrary files from the underlying Windows host through an out-of-band error-based channel. WebAdvisor entered end-of-support status in June 2022 and users are encouraged to migrate to Colleague Self-Service.
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Analysis
by VulDB Data Team • 10/15/2026
Ellucian WebAdvisor version 3.2 is susceptible to a critical unauthenticated XML External Entity injection vulnerability located within the /WebAdvisor/WebAdvisor endpoint. This flaw stems from the application's failure to properly configure its underlying XML parser, specifically by leaving external entity resolution and Document Type Definition processing enabled without adequate restrictions. In standard secure configurations, parsers should be explicitly instructed to ignore or disable DTDs and external entities to prevent attackers from injecting malicious content that interacts with the server's environment. Because this vulnerability does not require authentication, any remote attacker can interact directly with the endpoint by submitting crafted XML POST requests, bypassing access controls entirely and gaining a foothold within the application layer without needing valid credentials or prior reconnaissance of user accounts.
The technical exploitation of this XXE flaw allows for several severe attack vectors that extend beyond simple data leakage. By manipulating the XML structure to reference external resources controlled by an attacker, it is possible to force the vulnerable server into making Server-Side Request Forgery requests. This capability enables the attacker to probe internal network services that are not exposed to the public internet, effectively using WebAdvisor as a pivot point for further lateral movement within the organization's infrastructure. Furthermore, the vulnerability can be leveraged to coerce the disclosure of NTLMv2 hashes through carefully crafted SMB share references embedded in the XML payload. When the server attempts to resolve these external entities against an attacker-controlled domain or file share, it authenticates using its own credentials, thereby transmitting sensitive hash material that can subsequently be cracked offline to obtain full administrative access to the host system.
In addition to network-based attacks and credential theft, this vulnerability facilitates direct arbitrary file read operations on the underlying Windows operating system hosting WebAdvisor. Through an out-of-band error-based channel, attackers can construct XML payloads that reference local file paths such as C:\Windows\system32\drivers\etc\hosts or other sensitive configuration files. The server processes these references and returns content within HTTP response errors or logs, allowing the attacker to exfiltrate system configurations, database connection strings, application secrets, and potentially source code containing hardcoded credentials. This capability significantly escalates the risk profile from a simple web application flaw to a complete compromise of the host environment, as access to local files often reveals pathways to privilege escalation and deeper network infiltration.
The operational impact of this vulnerability is compounded by the fact that Ellucian WebAdvisor 3.2 has reached end-of-support status as of June 2022. This means that no further security patches or updates are being released by the vendor, leaving organizations using this version permanently exposed to known exploitation techniques without a direct remediation path from the software provider. The lack of ongoing support also implies that newer threat intelligence and detection signatures may not be optimized for this specific legacy implementation, making it harder to detect active attacks in real-time. Organizations must treat any remaining instances of WebAdvisor 3.2 as high-risk assets requiring immediate isolation or replacement rather than relying on incremental fixes.
To mitigate the risks associated with this vulnerability, organizations should prioritize migrating away from Ellucian WebAdvisor 3.2 to supported alternatives such as Colleague Self-Service, which receives regular security updates and adheres to modern development standards that prevent XXE by default. For environments where immediate migration is not feasible due to operational constraints, strict network segmentation must be implemented to isolate the vulnerable server from internal networks and external internet access wherever possible. Additionally, deploying a Web Application Firewall with specific rulesets designed to detect and block XML External Entity injection patterns can provide a layer of defense in depth. It is also critical to disable DTD processing and external entity resolution at the application configuration level if any legacy settings allow it, although given the end-of-support status, this may not fully mitigate all attack vectors associated with older parser implementations.
From a classification perspective, this vulnerability aligns with CWE-611, which describes Improper Restriction of XML External Entity Reference, and falls under MITRE ATT&CK technique T1190, Exploit Public-Facing Application. The ability to read local files corresponds to CWE-200, Exposure of Sensitive Information to an Unauthorized Actor, while the SSRF capabilities map to CWE-918. Recognizing these mappings helps in aligning remediation efforts with industry-standard security frameworks and ensures that defensive measures address both the immediate exploitation path and the broader implications for system integrity and confidentiality.