CVE-2026-90769 PUBLISHED

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.

• George Chen reporter

• GitHub Issue #1284
• 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
• VulnCheck Advisory: Open Notebook before 1.11.0 Server-Side Request Forgery via link-source

• Server-Side Request Forgery (SSRF) CWE