CVE-2026-40196: CWE-708: Incorrect Ownership Assignment in sysadminsmedia homebox
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ID remained permanently assigned to a user after being invited to a group, even after their access to that group was revoked.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.
AI Analysis
Technical Summary
HomeBox, a home inventory and organization system, had a vulnerability (CWE-708) in versions before 0.25.0 where the defaultGroup ID was not cleared after a user was removed from a group. The web interface enforced access controls properly, but the API failed to validate the defaultGroup ID if the X-Tenant header was missing. This allowed users to bypass access controls and perform create, read, update, and delete operations on group collections they should no longer access. The vulnerability is addressed in version 0.25.0.
Potential Impact
An attacker with at least limited privileges could exploit this vulnerability to bypass intended access controls via the API, gaining unauthorized full control (create, read, update, delete) over group collections. This leads to a high impact on confidentiality and integrity of data within the affected groups. Availability impact is not indicated. There are no known exploits in the wild as of the published date.
Mitigation Recommendations
Upgrade HomeBox to version 0.25.0 or later, where this vulnerability has been fixed. Since the vendor advisory indicates the issue is resolved in this version, applying this official fix is the recommended remediation. Patch status is confirmed by the vendor's versioning information.
CVE-2026-40196: CWE-708: Incorrect Ownership Assignment in 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ID remained permanently assigned to a user after being invited to a group, even after their access to that group was revoked.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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
HomeBox, a home inventory and organization system, had a vulnerability (CWE-708) in versions before 0.25.0 where the defaultGroup ID was not cleared after a user was removed from a group. The web interface enforced access controls properly, but the API failed to validate the defaultGroup ID if the X-Tenant header was missing. This allowed users to bypass access controls and perform create, read, update, and delete operations on group collections they should no longer access. The vulnerability is addressed in version 0.25.0.
Potential Impact
An attacker with at least limited privileges could exploit this vulnerability to bypass intended access controls via the API, gaining unauthorized full control (create, read, update, delete) over group collections. This leads to a high impact on confidentiality and integrity of data within the affected groups. Availability impact is not indicated. There are no known exploits in the wild as of the published date.
Mitigation Recommendations
Upgrade HomeBox to version 0.25.0 or later, where this vulnerability has been fixed. Since the vendor advisory indicates the issue is resolved in this version, applying this official fix is the recommended remediation. Patch status is confirmed by the vendor's versioning information.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-09T20:59:17.620Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69e2a136bdfbbecc59908358
Added to database: 4/17/2026, 9:08:06 PM
Last enriched: 4/17/2026, 9:23:09 PM
Last updated: 4/21/2026, 6:25:10 AM
Views: 24
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