CVE-2026-27167

MEDIUM EPSS 36.1%
Published Feb 27, 20264mo ago · Modified Mar 5, 20263mo ago
5.9 CVSS 3.1
Medium
Find Similar
Published Feb 27, 2026 4mo ago
Last Modified Mar 5, 2026 3mo ago

Description

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 Details

Base Score
5.9
Exploitability
2.2
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability None

Threat Intelligence

EPSS Exploit Probability
36.1% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available

Weaknesses 2

CWE-522
CWE-798 Use of Hard-coded Credentials Authentication

Affected Products 1

VendorProductVersionRange
gradio_projectgradio*≥4.16.0  –  <6.6.0

References 1

  • github.com https://github.com/gradio-app/gradio/security/advisories/GHSA-h3h8-3v2v-rg7m
    ExploitVendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.