CVE-2026-90769
Received Received - Intake

Open Notebook SSRF via Unvalidated URL Parameter

Publication date: 2026-09-13

Last updated on: 2026-09-13

Assigner: VulnCheck

Description
Open Notebook before 1.11.0 fails to validate the URL parameter in POST /api/sources endpoint, allowing authenticated users to perform server-side requests to internal services. Attackers can supply arbitrary URLs to read cloud metadata, internal network services, and localhost-bound services through the application server's direct HTTP requests.

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Meta Information

Published
2026-09-13
Last Modified
2026-09-13
Generated
2026-09-13
AI Q&A
2026-09-13
EPSS Evaluated
N/A
NVD
CVE-2026-90769
EUVD
EUVD-2026-76990

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
open_notebook open_notebook to 1.11.0 (exc)
lfnovo open_notebook to 1.11.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-918 The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Attack-Flow Graph

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Executive Summary

This is a Server-Side Request Forgery (SSRF) vulnerability in Open Notebook versions before 1.11.0. It allows authenticated users to supply arbitrary URLs to the POST /api/sources endpoint, causing the server to make direct HTTP requests to internal services, cloud metadata endpoints, localhost-bound services, or other internal network resources. The application fails to validate the URL parameter, enabling attackers to bypass network restrictions and access sensitive internal data.

Detection Guidance

To detect this SSRF vulnerability in Open Notebook, check if the application is running a version before 1.11.0. Inspect network traffic for outbound requests from the server to internal or cloud metadata endpoints (e.g., 169.254.169.254). Test the /api/sources endpoint with a POST request containing a type=link parameter and a malicious URL to see if the server fetches it.

Impact Analysis

An attacker could exploit this to read cloud metadata, access internal network services, or interact with localhost-bound services through the application server. This may expose sensitive data like cloud credentials or internal service responses. The impact depends on the server's configuration and network setup, potentially leading to unauthorized data access or further attacks.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating confidentiality requirements under GDPR and HIPAA. Exposure of cloud metadata or internal services may result in non-compliance with data protection and privacy regulations, potentially leading to legal penalties or reputational damage.

Mitigation Strategies

Upgrade Open Notebook to version 1.11.0 or later to apply the SSRF fix. If immediate upgrade is not possible, restrict network access to the server and block internal/cloud metadata endpoints. Ensure authentication is enforced in Docker deployments. Monitor for unusual outbound requests from the application.

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