CVE-2026-35029 PoC — LiteLLM affected by privilege escalation via unrestricted proxy configuration endpoint

Title:LiteLLM affected by privilege escalation via unrestricted proxy configuration endpoint (CVE-2026-35029)
Description:LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.83.0, the /config/update endpoint does not enforce admin role authorization. A user who is already authenticated into the platform can then use this endpoint to modify proxy configuration and environment variables, register custom pass-through endpoint handlers pointing to attacker-controlled Python code, achieving remote code execution, read arbitrary server files by setting UI_LOGO_PATH and fetching via /get_image, and take over other privileged accounts by overwriting UI_USERNAME and UI_PASSWORD environment variables. Fixed in v1.83.0.

LiteLLM < 1.83.0 contains a broken access control vulnerability caused by lack of admin role enforcement on /config/update endpoint, letting authenticated users modify configurations, execute code, read files, and take over accounts.

 id: CVE-2026-35029

info:
  name: LiteLLM - Arbitrary File Read
  author: theamanrawat
  severity: h

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