Identity Spoofing

An authenticated low-privilege user can exploit CVE-2026-59216 in Open WebUI versions prior to 0.10.0 to execute arbitrary Python code or tools within another user's authenticated session by supplying an unvalidated `session_id`, which, if targeting an administrator, leads to remote code execution on the server as the root process.

Symfony's X509Authenticator is vulnerable to identity spoofing due to an unanchored regex in the extraction of the user identifier from the Subject DN of client certificates, allowing attackers to authenticate as other users by crafting a certificate with a malicious CN value.

MCPHub is vulnerable to user identity spoofing on the MCP transport layer; an unauthenticated network user can impersonate any user, including administrators, on SSE/MCP endpoints by providing the target username in the URL path, which allows execution of MCP tool calls under a spoofed user's identity, access to user-scoped resources and data, and poisoning of audit logs.

IBM WebSphere Application Server Liberty versions 17.0.0.3 through 26.0.0.4 are susceptible to identity spoofing when applications are deployed without proper authentication and authorization configurations, potentially leading to unauthorized access and privilege escalation.