CVE-2026-35029: berriai litellm Incorrect Authorization

Vulnerability summary

CVE-2026-35029 is a high (CVSS 8.8) Incorrect Authorization vulnerability in berriai litellm. EPSS estimates a 3.98% chance of exploitation in the next 30 days, higher than 90.4% of scored vulnerabilities.

Timeline

1. 06-04-2026
   PublishedVulnerability first disclosed.
2. 15-07-2026
   Last modifiedVulnerability information updated.

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.

• CWE-863Incorrect AuthorizationThe product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
• CWE-425Direct Request ('Forced Browsing')The web application does not adequately enforce appropriate authorization on all restricted URLs, scripts, or files.