CVE-2026-18640 — HIGH (7.1)

Vulnerability Description

The NewNotebook API does not sufficiently sanitize its parameters allowing an authenticated user with NOTEBOOK_EDIT permission to write the notebook record outside the org's data store directory. The file written must have an extension of ".json.db" but can otherwise overwrite other metadata files (such as ACL records, hunts etc). This can corrupt these files and cause data corruption.

CVSS Score

7.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

HIGH

Availability

LOW

Related Weaknesses (CWE)

CWE-22

References

http://docs.velociraptor.app/announcements/advisories/cve-2026-18640/

FAQ

What is CVE-2026-18640?

CVE-2026-18640 is a vulnerability with a CVSS score of 7.1 (HIGH). The NewNotebook API does not sufficiently sanitize its parameters allowing an authenticated user with NOTEBOOK_EDIT permission to write the notebook record outside the org's data store directory. The ...

How severe is CVE-2026-18640?

CVE-2026-18640 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-18640?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.