# CVE-2026-90769

## Summary

- **CVE ID:** CVE-2026-90769
- **Severity:** HIGH
- **CVSS Score:** 8.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N)
- **CWE:** CWE-918
- **Published:** Sep 13, 2026
- **Last Modified:** Sep 14, 2026

## 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.

## Affected Products

- lfnovo — open-notebook (0)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.26%
- **EPSS Percentile:** 17.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._