SSRF in Lfnovo Open-Notebook
CVE-2026-90769
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (35.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/lfnovo/open-notebook/issues/1284 (issue-tracking)
- github.com/lfnovo/open-notebook (product)
- github.com/lfnovo/open-notebook/blob/8889087e317177d7b6e286342ab34e0c9c01d43e/a… (technical-description)
- github.com/lfnovo/open-notebook/commit/9045ea50196927eac7de647bb5b7009349236fb4 (patch)
- www.vulncheck.com/advisories/open-notebook-before-1.11.0-server-side-request-fo… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-90769?
- CVE-2026-90769 is a high-severity vulnerability in Lfnovo Open-Notebook, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.7/10. Published 2026-09-13.
- How severe is CVE-2026-90769?
- High severity. CVSS v3 base score is 7.7 out of 10.