SolarWinds Web Help Desk before version 2026.1 contains an insecure deserialization vulnerability in the jabsorb JSON-RPC library. When chained with a CSRF whitelist bypass (CVE-2025-40536), remote unauthenticated attackers can exploit JNDI injection via the Apache Xalan JNDIConnectionPool class to achieve remote code execution. The bypass involves including "/ajax/" in a query parameter to circumvent URI validation, while switching from "/ajax/" to "/wo/" endpoints bypasses payload sanitization routines.
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