Server-Side Request Forgery in Open Notebook Affects Internal Services
CVE-2026-90769

8.3HIGH

Key Information:

Vendor

Lfnovo

Status
Open-notebook
Vendor
CVE Published:
13 September 2026

What is CVE-2026-90769?

The Open Notebook software prior to version 1.11.0 is vulnerable to a server-side request forgery (SSRF) issue due to insufficient validation of the URL parameter in the POST /api/sources endpoint. This vulnerability allows authenticated users to send arbitrary URLs, potentially granting them access to sensitive internal service endpoints, cloud metadata, and localhost-bound resources via direct HTTP requests. Exploiting this flaw could lead to significant security ramifications as attackers can exploit it to retrieve sensitive data from within the internal network.

Affected Version(s)

open-notebook 0 < 1.11.0

References

https://github.com/lfnovo/open-notebook/issues/1284
issue-tracking
https://github.com/lfnovo/open-notebook
product
https://github.com/lfnovo/open-notebook/blob/8889087e3171...
technical-description

CVSS V4

Score:
8.3
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

George Chen
.