gradio-app gradio up to 6.5.x OAuth /login/huggingface get_token hard-coded credentials

Summaryinfo

A vulnerability was found in gradio-app gradio up to 6.5.x and classified as critical. This affects the function get_token of the file /login/huggingface of the component OAuth Component. The manipulation results in hard-coded credentials. This vulnerability is known as CVE-2026-27167. It is possible to launch the attack remotely. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in gradio-app gradio up to 6.5.x. Affected is the function get_token of the file /login/huggingface of the component OAuth Component. The manipulation with an unknown input leads to a hard-coded credentials vulnerability. CWE is classifying the issue as CWE-798. The product contains hard-coded credentials, such as a password or cryptographic key, which it uses for its own inbound authentication, outbound communication to external components, or encryption of internal data. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-27167 since 02/18/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1110.001.

Upgrading to version 6.6.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-9075). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• gradio-app

Name

• gradio

Version

• 6.0
• 6.1
• 6.2
• 6.3
• 6.4
• 6.5

Website

• Product: https://github.com/gradio-app/gradio/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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