Vulnerability details
CVE-2026-40196
HomeBox has Unauthorized API Access via Retained defaultGroup ID After Group Access Revocation
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ID remained permanently assigned to a user after being invited to a group, even after their access to that group was revoked.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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.1High | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| sysadminsmedia | homebox | < 0.25.0 | CVEProject cvelistV5 (CNA) |
References and advisories
2- https://github.com/sysadminsmedia/homebox/security/advisories/GHSA-6pvm-v73p-p6m9 x_refsource_CONFIRM
- https://github.com/sysadminsmedia/homebox/releases/tag/v0.25.0 x_refsource_MISC
Details
- Published
- 2026-04-18
- Last updated
- 2026-04-20
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-708Incorrect Ownership Assignment