Is CVE-2026-40196 actively exploited?

No active exploitation of CVE-2026-40196 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-40196 be exploited remotely?

Yes. CVE-2026-40196 is exploitable remotely over the network (CVSS attack vector: Network).

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

CVE-2026-40196 has a CVSS score of 8.1 (HIGH).

HOME VULNERABILITIESCVE-2026-40196

HIGH

CVE-2026-40196

CWE-708Published: April 17, 2026· Updated: Apr 24, 2026

8.1

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:8.1th

Official 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ID remained permanently assigned to a user after being invited to a group, even after their access to that group was revoked.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.

NVD Source

Technical Analysis

CVE-2026-40196 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 8.1.