Open WebUI: Mass Assignment via FeedbackForm extra=allow Allows Feedback User ID Spoofing and Evaluation Data Manipulation — CVE-2026-45396

Summary

# Mass Assignment in Feedback Creation Allows User ID Spoofing and Evaluation Data Manipulation ## Summary The `POST /api/v1/evaluations/feedback` endpoint in Open WebUI v0.9.2 is vulnerable to mass assignment via `FeedbackForm`, which uses `model_config = ConfigDict(extra='allow')`. Due to an insecure dictionary merge order in `insert_new_feedback()`, an authenticated attacker can inject a `user_id` field in the…

Product

pip: open-webui

What to do

General, cautious steps (verify details in the official source):

• Review exposure and plan remediation based on risk and environment.
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

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