Is CVE-2026-40196 actively exploited?

CVE-2026-40196 has no public evidence of in-the-wild exploitation as of 2026-04-24.

What is the CVSS score for CVE-2026-40196?

CVE-2026-40196 has a CVSS score of 8.1 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

How do I patch CVE-2026-40196?

Patch guidance is available from sysadminsmedia security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-40196.

Which products are affected by CVE-2026-40196?

1 product: sysadminsmedia homebox.

Fix CVE-2026-40196 - HIGH sysadminsmedia homebox

Description

HomeBox is a home inventory and organization system. Versions prior to 0.25.0 contain a vulnerability where the defaultGroup ID remained permanently assigned to a user after being invited to a group, even after their access to that group was revoked. While the web interface correctly enforced the access revocation and prevented the user from viewing or modifying the group's contents, the API did not. Because the original group ID persisted as the user's defaultGroup, and this value was not properly validated when the X-Tenant header was omitted, the user could still perform full CRUD operations on the group's collections through the API, bypassing the intended access controls. This issue has been fixed in version 0.25.0.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack Vector: network
Complexity: low
Privileges: low
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: none
Weaknesses: CWE-708

Metadata

Primary Vendor: SYSADMINSMEDIA
Published: 4/17/2026
Last Modified: 4/24/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

sysadminsmedia : homebox

Remediation Guidance

Executive Summary

Cite this page

CVE-2026-40196. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2026-40196

View on NIST NVD

CVE-2026-40196 vulnerability