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CVE-2026-27167

CVE-2026-27167 · Gradio: Mocked OAuth Login Exposes Server Credentials and Uses Hardcoded Session Secret

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Gradio is an open-source Python package designed for quick prototyping. Starting in version 4.16.0 and prior to version 6.6.0, Gradio applications running outside of Hugging Face Spaces automatically enable "mocked" OAuth routes when OAuth components (e.g. `gr.LoginButton`) are used. When a user visits `/login/huggingface`, the server retrieves its own Hugging Face access token via `huggingface_hub.get_token()` and stores it in the visitor's session cookie. If the application is network-accessible, any remote attacker can trigger this flow to steal the server owner's HF token. The session cookie is signed with a hardcoded secret derived from the string `"-v4"`, making the payload trivially decodable. Version 6.6.0 fixes the issue.

CVSS 0.0 · Low · EPSS 0.4% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • gradio

    Versions
    • >= 4.16.0, < 6.6.0: Affected

    No fix published

  • gradio PyPI

    Versions
    • 4.16.0
    • 4.17.0
    • 4.18.0
    • 4.19.0
    • 4.19.1
    • 4.19.2
    • 4.20.0
    • 4.20.1
    • 4.21.0
    • 4.22.0
    • 4.23.0
    • 4.24.0
    • 4.25.0
    • 4.26.0
    • 4.27.0
    • 4.28.0
    • 4.28.1
    • 4.28.2
    • 4.28.3
    • 4.29.0
    • 4.31.0
    • 4.31.1
    • 4.31.2
    • 4.31.3
    • 4.31.4
    • 4.31.5
    • 4.32.0
    • 4.32.1
    • 4.32.2
    • 4.33.0
    • 4.35.0
    • 4.36.0
    • 4.36.1
    • 4.37.1
    • 4.37.2
    • 4.38.0
    • 4.38.1
    • 4.39.0
    • 4.40.0
    • 4.41.0
    • 4.42.0
    • 4.43.0
    • 4.44.0
    • 4.44.1
    • 5.0.0
    • 5.0.0b1
    • 5.0.0b10
    • 5.0.0b5
    • 5.0.0b6
    • 5.0.0b7
    • 5.0.0b8
    • 5.0.0b9
    • 5.0.1
    • 5.0.2
    • 5.1.0
    • 5.10.0
    • 5.11.0
    • 5.12.0
    • 5.13.0
    • 5.13.1
    • 5.13.2
    • 5.14.0
    • 5.15.0
    • 5.16.0
    • 5.16.1
    • 5.16.2
    • 5.17.0
    • 5.17.1
    • 5.18.0
    • 5.19.0
    • 5.20.0
    • 5.20.1
    • 5.21.0
    • 5.22.0
    • 5.23.0
    • 5.23.1
    • 5.23.2
    • 5.23.3
    • 5.24.0
    • 5.25.0
    • 5.25.1
    • 5.25.2
    • 5.26.0
    • 5.27.0
    • 5.27.1
    • 5.28.0
    • 5.29.0
    • 5.29.1
    • 5.3.0
    • 5.30.0
    • 5.31.0
    • 5.32.0
    • 5.32.1
    • 5.33.0
    • 5.33.1
    • 5.33.2
    • 5.34.0
    • 5.34.1
    • 5.34.2
    • 5.35.0
    • 5.36.2
    • 5.37.0
    • 5.38.0
    • 5.38.1
    • 5.38.2
    • 5.39.0
    • 5.4.0
    • 5.40.0
    • 5.41.0
    • 5.41.1
    • 5.42.0
    • 5.43.0
    • 5.43.1
    • 5.44.0
    • 5.44.1
    • 5.45.0
    • 5.46.0
    • 5.46.1
    • 5.47.0
    • 5.47.1
    • 5.47.2
    • 5.48.0
    • 5.49.0
    • 5.49.1
    • 5.5.0
    • 5.50.0
    • 5.50.0.dev0
    • 5.50.1.dev0
    • 5.50.1.dev1
    • 5.6.0
    • 5.7.0
    • 5.7.1
    • 5.8.0
    • 5.9.0
    • 5.9.1
    • 6.0.0
    • 6.0.0.dev0
    • 6.0.0.dev1
    • 6.0.0.dev3
    • 6.0.0.dev4
    • 6.0.0.dev5
    • 6.0.1
    • 6.0.2
    • 6.1.0
    • 6.2.0
    • 6.3.0
    • 6.4.0
    • 6.5.0
    • 6.5.1
    Affected ranges
    • ECOSYSTEM: ≥ 4.16.0, < 6.6.0

    Update to 6.6.0

Original sources

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