CVE-2026-85695 FastChat Unauthenticated Worker Registration SSRF and Model Spoofing

FastChat contains an authentication bypass vulnerability in the /registerworker endpoint that allows unauthenticated attackers to register arbitrary worker addresses and perform server-side request forgery. Attackers can register malicious workers under victim model names to intercept user prompt...

CVE-2026-85695 FastChat Unauthenticated Worker Registration SSRF and Model Spoofing

FastChat contains an authentication bypass vulnerability in the /registerworker endpoint that allows unauthenticated attackers to register arbitrary worker addresses and perform server-side request forgery. Attackers can register malicious workers under victim model names to intercept user prompt...

CVE-2026-85695 FastChat Unauthenticated Worker Registration SSRF and Model Spoofing

FastChat contains an authentication bypass vulnerability in the /registerworker endpoint that allows unauthenticated attackers to register arbitrary worker addresses and perform server-side request forgery. Attackers can register malicious workers under victim model names to intercept user prompt...

CVE-2026-85695

FastChat (lm-sys/FastChat) has an authentication bypass in the /register_worker endpoint that allows unauthenticated attackers to register arbitrary worker addresses. This enables server-side request forgery (SSRF) and model spoofing : attackers can register malicious workers under victim model n...