# CVE-2026-85286: HomeBox: Timing Side-Channel in Login Endpoint Allows User Enumeration via Bcrypt Hashing Delay

Status: published. Published: 2026-11-05. Updated: 2026-11-05.

HomeBox is a home inventory and organization system. Prior to 0.27.0, the POST /api/v1/users/login endpoint performs password-hash verification only when the submitted username matches an existing account, while unknown usernames return immediately. Although both paths return the same 401 unauthorized response, the processing-time discrepancy allows an unauthenticated remote attacker to distinguish registered email addresses; rate limiting only reduces the number of attempts per window. This issue is fixed in version 0.27.0.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- sysadminsmedia / homebox: < 0.27.0 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 3.7 (low); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-204, CWE-208

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/sysadminsmedia/homebox/security/advisories/GHSA-4p8r-vm9v-c9pm (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/sysadminsmedia/homebox/commit/66809ce3583cbd0b43e8f5ce30cc269a1cfe4201 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/sysadminsmedia/homebox/releases/tag/v0.27.0 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-85286; retrieved 2026-11-05; source updated 2026-11-05

Revision: cf2bb5da613ca7c96df4af33757e8efbb21f81d5ad2535b08e3a3470d2df1e72

Canonical: https://y2.dev/cve/CVE-2026-85286

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