# CVE-2026-116680: Homebox generic notifier SSRF via HTTP redirect after URL validation

Status: published. Published: 2026-10-27. Updated: 2026-11-03.

HomeBox is a home inventory and organization system. Prior to version 0.27.0, Homebox validates generic notifier URLs with ValidateNotifierURL before creation, update, testing, and scheduled delivery, but shoutrrr sends the request through http.DefaultClient.Do without a CheckRedirect policy that revalidates each Location target. An authenticated collection member can configure a permitted notifier host that redirects to loopback, link-local, cloud metadata, or another blocked destination, causing the follow-up request to bypass the product's SSRF policy. The flaw is reachable through POST /api/v1/notifiers/test for immediate requests and through stored notifiers during scheduled maintenance delivery. 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: 6.4 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: 0.19% as of 2026-11-02; percentile 8.67%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-918

## Exploit evidence

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

## References

- https://github.com/sysadminsmedia/homebox/security/advisories/GHSA-4gp5-59x3-vhhg (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/sysadminsmedia/homebox/commit/52eb6f3511bf239bcf34a87a4d13cedd2f704122 (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-2026-116680; retrieved 2026-11-03; source updated 2026-11-03

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-116680; retrieved 2026-11-03; source updated Not reported

Revision: dd9c67ca885f388b61561b4c8c4935e10db941776a489afa32e54e73e013fe24

Canonical: https://y2.dev/cve/CVE-2026-116680

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