What’s Vulnerable › Vulnerabilities

CVE-2026-90769: Open Notebook before 1.11.0 Server-Side Request Forgery via link-source

• Severity: high (CVSS 7.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-13 · updated 2026-09-24
• Weakness: CWE-918

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

• Open Notebook: before 1.11.0 — fixed in 1.11.0

How to fix

Upgrade to a fixed version: Open Notebook 1.11.0. Check the vendor advisory for mitigations.

References

• https://github.com/lfnovo/open-notebook
• https://github.com/lfnovo/open-notebook/blob/8889087e317177d7b6e286342ab34e0c9c01d43e/api/routers/sources.py
• https://github.com/lfnovo/open-notebook/commit/9045ea50196927eac7de647bb5b7009349236fb4
• 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://github.com/lfnovo/open-notebook/issues/1284

Get alerted when CVE-2026-90769 or the next vulnerability affects your stack