What is CVE-2026-63099?

CVE-2026-63099 is a medium-severity vulnerability in Thehive-Project Thehive, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-07-17.

How severe is CVE-2026-63099?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Thehive-Project Thehive

CVE-2026-63099

TheHive through 4.1.24 contains a broken object-level authorization vulnerability in the attachment download endpoints that allows any authenticated user to access attachments belonging to other organizations by supplying a content-hash identifier. Attackers can exploit the missing organization-scoped authorization check in AttachmentSrv.visible, which is implemented as a pass-through traversal, to download arbitrary attachments.

Vulnerability class: IDOR (Insecure Direct Object Reference)

EPSS: 0.004 (28.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

Thehive-project Thehive — versions 0

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

Researcher Disclosure (technical-description, exploit)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-63099?: CVE-2026-63099 is a medium-severity vulnerability in Thehive-Project Thehive, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-07-17.
How severe is CVE-2026-63099?: Medium severity. CVSS v3 base score is 6.5 out of 10.