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Vulnerability record · CVE-2026-18640 · published 11 August 2026

CVE-2026-18640: Path traversal vulnerability

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.

7.1 CVSS 3.1 High EPSS 0.43% · top 64.8% CWE-22 · Path traversal Awaiting Analysis
7.1CVSS 3.1 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
28 Aug 2026Last modified by NVD

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

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-18640), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.