CVE-2026-84860 in ScadaLTS
Summary
by MITRE • 09/16/2026
ScadaLTS 2.8.1-release-candidate build 0 is affected by an Authorization Bypass
Spring Security gates DWR endpoints by URL path pattern, but DWR itself dispatches method calls based on the POST body parameters c0-scriptName and c0-methodName. The crossDomainSessionSecurity setting in web.xml is set to false, which disables DWR's built-in origin validation. This means any authenticated user can invoke any DWR method (regardless of the URL-based access control) by sending their request to a URL they are permitted to access (e.g. MiscDwr.initializeLongPoll.dwr) while targeting a restricted class in the POST body.
This is the systemic root cause that enables multiple other findings to be exploited as a low privilege user.
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Analysis
by VulDB Data Team • 09/16/2026
The vulnerability identified in ScadaLTS 2.8.1-release-candidate build 0 represents a critical authorization bypass rooted in the misconfiguration of security boundaries between Spring Security and the Dynamic Web Remoting framework. The application relies on Spring Security to enforce access control by gating Data Access Objects based on URL path patterns, assuming that restricting access to specific endpoints will prevent unauthorized method invocation. However, this assumption fails because DWR dispatches actual method calls not solely through the request URI but also via parameters embedded in the POST body, specifically c0-scriptName and c0-methodName. This architectural disconnect creates a situation where the URL-based security check is decoupled from the actual business logic execution, allowing attackers to bypass intended restrictions by targeting restricted classes within requests sent to permitted URLs.
The root cause of this exploitation vector lies in the configuration setting crossDomainSessionSecurity being set to false within the web.xml file. This setting disables DWR's built-in origin validation mechanisms, which are designed to prevent Cross-Site Request Forgery and unauthorized remote invocations from different origins or contexts. By disabling these protections, the application fails to validate whether the request context matches the expected security domain for the targeted method. Consequently, any authenticated user, regardless of their privilege level, can craft a POST request that targets a restricted DWR class while sending it to a URL they are explicitly permitted to access, such as MiscDwr.initializeLongPoll.dwr. The server processes this request by validating only the URL path against Spring Security rules and then executing the method specified in the body parameters, effectively ignoring the intended role-based restrictions on the targeted functionality.
This vulnerability has significant operational impact as it serves as a systemic enabler for multiple other security findings within the application. By exploiting this authorization bypass, an attacker with low-privilege credentials can escalate their capabilities to perform actions reserved for higher-level administrators or restricted system functions. This undermines the principle of least privilege and compromises the integrity of the supervisory control and data acquisition environment managed by ScadaLTS. The ability to invoke arbitrary methods means that sensitive operations, such as modifying configuration settings, accessing real-time process data, or executing commands, can be performed without proper authorization checks, leading to potential operational disruption, data leakage, or complete system compromise depending on the specific DWR methods exposed and their underlying functionality.
To mitigate this vulnerability, immediate remediation steps should focus on aligning Spring Security configurations with DWR's execution model rather than relying solely on URL-based path patterns. Developers must implement method-level security annotations such as @PreAuthorize within the DWR service classes to ensure that access control is enforced at the point of business logic execution regardless of how the request was dispatched. Additionally, it is advisable to re-enable cross-domain session validation by setting crossDomainSessionSecurity to true in web.xml if cross-origin requests are not required for legitimate application functionality. If cross-origin communication is necessary, strict origin whitelisting should be implemented instead of disabling all validations. Furthermore, conducting a comprehensive audit of DWR endpoint configurations and ensuring that security filters intercept method invocations rather than just URL paths will help prevent similar bypasses in the future.