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Vulnerability Details :

CVE-2026-27167

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-27 Feb, 2026 | 21:40
Updated At-27 Feb, 2026 | 21:40
Rejected At-
Credits

Gradio: Mocked OAuth Login Exposes Server Credentials and Uses Hardcoded Session Secret

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:27 Feb, 2026 | 21:40
Updated At:27 Feb, 2026 | 21:40
Rejected At:
▼CVE Numbering Authority (CNA)
Gradio: Mocked OAuth Login Exposes Server Credentials and Uses Hardcoded Session Secret

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.

Affected Products
Vendor
gradio-app
Product
gradio
Versions
Affected
  • >= 4.16.0, < 6.6.0
Problem Types
TypeCWE IDDescription
CWECWE-798CWE-798: Use of Hard-coded Credentials
CWECWE-522CWE-522: Insufficiently Protected Credentials
Type: CWE
CWE ID: CWE-798
Description: CWE-798: Use of Hard-coded Credentials
Type: CWE
CWE ID: CWE-522
Description: CWE-522: Insufficiently Protected Credentials
Metrics
VersionBase scoreBase severityVector
3.10.0NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:N
Version: 3.1
Base score: 0.0
Base severity: NONE
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/gradio-app/gradio/security/advisories/GHSA-h3h8-3v2v-rg7m
x_refsource_CONFIRM
Hyperlink: https://github.com/gradio-app/gradio/security/advisories/GHSA-h3h8-3v2v-rg7m
Resource:
x_refsource_CONFIRM
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:27 Feb, 2026 | 22:16
Updated At:27 Feb, 2026 | 22:16

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.10.0NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:N
Type: Secondary
Version: 3.1
Base score: 0.0
Base severity: NONE
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:N
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-522Primarysecurity-advisories@github.com
CWE-798Primarysecurity-advisories@github.com
CWE ID: CWE-522
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-798
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/gradio-app/gradio/security/advisories/GHSA-h3h8-3v2v-rg7msecurity-advisories@github.com
N/A
Hyperlink: https://github.com/gradio-app/gradio/security/advisories/GHSA-h3h8-3v2v-rg7m
Source: security-advisories@github.com
Resource: N/A

Change History

0
Information is not available yet

Similar CVEs

1Records found
CVE-2023-25823
Matching Score-6
Assigner-GitHub, Inc.
ShareView Details
Matching Score-6
Assigner-GitHub, Inc.
CVSS Score-5.4||MEDIUM
EPSS-0.41% / 60.74%
||
7 Day CHG+0.29%
Published-23 Feb, 2023 | 21:34
Updated-10 Mar, 2025 | 21:06
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Gradio contains Use of Hard-coded Credentials

Gradio is an open-source Python library to build machine learning and data science demos and web applications. Versions prior to 3.13.1 contain Use of Hard-coded Credentials. When using Gradio's share links (i.e. creating a Gradio app and then setting `share=True`), a private SSH key is sent to any user that connects to the Gradio machine, which means that a user could access other users' shared Gradio demos. From there, other exploits are possible depending on the level of access/exposure the Gradio app provides. This issue is patched in version 3.13.1, however, users are recommended to update to 3.19.1 or later where the FRP solution has been properly tested.

Action-Not Available
Vendor-gradio_projectgradio-app
Product-gradiogradio
CWE ID-CWE-798
Use of Hard-coded Credentials
Details not found