Vulnerability · Published Sep 13, 2026 · Assigned by VulnCheck
CVE-2026-90769Open Notebook before 1.11.0 Server-Side Request Forgery via link-source
High 7.7
In plain English
A high-severity server-side request forgery in open-notebook from lfnovo. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities).
Severity (CVSS 3.1)7.7High
Exploit odds (30 days)0.4%top 64.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| lfnovo | open-notebook | 0 – before 1.11.0 |
Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
References
- GitHub Issue #1284 issue-tracking
- https://github.com/lfnovo/open-notebook product
- https://github.com/lfnovo/open-notebook/blob/8889087e317177d7b6e286342ab34e0c9c01d43e/api/routers/sources.py technical-description
- https://github.com/lfnovo/open-notebook/commit/9045ea50196927eac7de647bb5b7009349236fb4 patch
- VulnCheck Advisory: Open Notebook before 1.11.0 Server-Side Request Forgery via link-source third-party-advisory