---
title: "CVE-2026-90769: Open Notebook - Server Side Request Forgery"
description: "Open Notebook < 1.11.0 contains a server side request forgery caused by improper validation of URL parameter in POST /api/sources endpoint, letting authenticated users perform requests to internal services."
url: https://panop.io/threat-heartbeat/CVE-2026-90769/
---

# CVE-2026-90769 Open Notebook - Server Side Request Forgery

Open Notebook < 1.11.0 contains a server side request forgery caused by improper validation of URL parameter in POST /api/sources endpoint, letting authenticated users perform requests to internal services.

CVSS base score 7.7 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.41% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90769)

## Details

Type

Server Side Request Forgery

Impact

Information Disclosure

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Published

13 September 2026

Updated

15 October 2026

Weakness

[CWE-918](https://cwe.mitre.org/data/definitions/918.html)

## Vendor fix

Update to version 1.11.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-90769](https://nvd.nist.gov/vuln/detail/CVE-2026-90769)
- [https://github.com/lfnovo/open-notebook/commit/9045ea50196927eac7de647bb5b7009349236fb4](https://github.com/lfnovo/open-notebook/commit/9045ea50196927eac7de647bb5b7009349236fb4)
- [https://github.com/lfnovo/open-notebook/issues/1284](https://github.com/lfnovo/open-notebook/issues/1284)
- [https://www.vulncheck.com/advisories/open-notebook-before-1.11.0-server-side-request-forgery-via-link-source](https://www.vulncheck.com/advisories/open-notebook-before-1.11.0-server-side-request-forgery-via-link-source)
- [https://github.com/lfnovo/open-notebook](https://github.com/lfnovo/open-notebook)
- [https://github.com/lfnovo/open-notebook/blob/8889087e317177d7b6e286342ab34e0c9c01d43e/api/routers/sources.py](https://github.com/lfnovo/open-notebook/blob/8889087e317177d7b6e286342ab34e0c9c01d43e/api/routers/sources.py)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)