---
id: CVE-2026-90769
title: >-
  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
summary: >-
  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,…
severity: high
cvss: 7.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N'
cwe:
  - CWE-918
vendor: lfnovo
product: open-notebook
affected:
  - open-notebook < 1.11.0
published: '2026-09-13'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T16:17:38.833'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90769'
references:
  - url: 'https://github.com/lfnovo/open-notebook'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/lfnovo/open-notebook/blob/8889087e317177d7b6e286342ab34e0c9c01d43e/api/routers/sources.py
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/lfnovo/open-notebook/commit/9045ea50196927eac7de647bb5b7009349236fb4
    label: disclosure@vulncheck.com
  - url: 'https://github.com/lfnovo/open-notebook/issues/1284'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/open-notebook-before-1.11.0-server-side-request-forgery-via-link-source
    label: disclosure@vulncheck.com
  - url: 'https://github.com/lfnovo/open-notebook/issues/1284'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00257
epssPercentile: 0.17676
ingestedAt: '2026-09-14T15:23:07.471Z'
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-14T15:35:56.128393Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.