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CVE-2026-90769

Open Notebook before 1.11.0 Server-Side Request Forgery via link-source

HIGH

7.7

CVSS Score

Published: September 13, 2026 at 10:45 AM UTC

Updated: September 24, 2026 at 08:57 PM UTC

1 product affected across 1 vendorOpen Notebook

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Severity

HIGH7.7

Exploit prediction

EPSS 0.4%

SSVC

PoC

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Open Notebook · Lfnovo

90%

v < 1.11.0

Affected range stops below 1.11.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://github.com/lfnovo/open-notebook/commit/9045ea50196927eac7de647bb5b7009349236fb4

References (5)

Issue Tracking

Source: cverecord

https://github.com/lfnovo/open-notebook/issues/1284

Product

Source: cverecord

https://github.com/lfnovo/open-notebook

Technical Description

Source: cverecord

https://github.com/lfnovo/open-notebook/blob/8889087e317177d7b6e286342ab34e0c9c01d43e/api/routers/sources.py

Patch

Source: cverecord

https://github.com/lfnovo/open-notebook/commit/9045ea50196927eac7de647bb5b7009349236fb4

Third Party Advisory

Source: cverecord

https://www.vulncheck.com/advisories/open-notebook-before-1.11.0-server-side-request-forgery-via-link-source

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.7HIGHVulnCheck

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: CHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-918

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