CVE-2026-15704 is an authorization bypass vulnerability in Eclipse BaSyx Go Components versions up to and including 1.0.0 affecting ABAC-enabled deployments. The flaw is caused by inconsistent trailing-slash handling between the ABAC middleware and the HTTP router. The shared router configuration uses Chi's slash-stripping behavior, allowing a request with a trailing slash to be routed to a registered path without the slash, while the ABAC middleware evaluates the original unnormalized path. When the ABAC route lookup does not find a matching slash-suffixed route, the request can proceed to the router, which strips the slash and invokes the protected handler without the intended ABAC authorization decision and without the expected ABAC query filters. Affected services include deployments using the shared router and ABAC middleware such as AAS Repository, Submodel Repository, AAS Registry, Submodel Registry, Concept Description Repository, Discovery, AAS Environment upload, and related services.
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