Improper Input Validation in Open Notebook by lfnovo
CVE-2026-28201

8.7HIGH

Key Information:

Vendor

Open Notebook

Status
Open Notebook
Vendor
CVE Published:
7 May 2026

What is CVE-2026-28201?

An improper input validation and an excessively permissive default Cross-Origin Resource Sharing (CORS) configuration in Open Notebook v1.8.1 can be exploited by an attacker. This vulnerability allows a malicious user to craft a deceptive URL that, when accessed by a legitimate user, may lead to unauthorized alterations or deletions of database entries. In some deployment scenarios, this flaw can potentially enable data exfiltration, posing significant risks to data integrity and confidentiality.

Affected Version(s)

Open Notebook 0 <= 1.8.2

References

https://github.com/lfnovo/open-notebook/security/advisori...
vendor-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

CERT-EU
.