CVE-2026-90769

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 Platforms

Weakness Type

CWE-918

References

• https://github.com/lfnovo/open-notebook
• https://github.com/lfnovo/open-notebook/blob/8889087e317177d7b6e286342ab34e0c9c0…
• https://github.com/lfnovo/open-notebook/commit/9045ea50196927eac7de647bb5b700934…
• https://github.com/lfnovo/open-notebook/issues/1284
• https://www.vulncheck.com/advisories/open-notebook-before-1.11.0-server-side-req…
• https://github.com/lfnovo/open-notebook/issues/1284