# CVE-2026-48974: HomeBox: Forced Group Membership Without Consent in Homebox AddMember Handler

> Authenticated users can force others into groups without consent, exposing personal data and enabling further attacks in HomeBox.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Sep 2026
- **Updated:** 29 Sep 2026
- **Also known as:** GHSA-ffcw-whqh-hgqf

## What is CVE-2026-48974?

CVE-2026-48974 is a medium-severity missing authorization vulnerability in sysadminsmedia homebox, published on 21 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

HomeBox is a home inventory and organization system. Prior to 0.26.0, POST /v1/groups/members invokes HandleGroupMemberAdd and GroupService.AddMember using a caller-supplied userID without requiring an owner role, an invitation token, target-user consent, or target-user notification. Any authenticated user can force another account into the caller's group, disclose the target user's email address and name through the resulting member list, and create the membership prerequisite used by a separate cross-group inventory-wipe vulnerability. This issue is fixed in version 0.26.0.

Weakness: CWE-862 (Missing Authorization), CWE-841 (Improper Enforcement of Behavioral Workflow)

## Which versions are affected by CVE-2026-48974?


## How do I fix CVE-2026-48974?

No fix has been published for CVE-2026-48974 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-48974 being exploited?

There is no known exploitation of CVE-2026-48974 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-48974 and fix it if it is affected.

What it is: CVE-2026-48974 is a medium-severity missing authorization vulnerability in sysadminsmedia homebox, published on 21 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-48974 in the wild and no public exploit code.

Affected product: sysadminsmedia homebox. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-48974/ (Markdown: https://insights.sbomify.com/CVE-2026-48974/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-48974
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-48974
- OSV: https://osv.dev/vulnerability/CVE-2026-48974

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-48974/
Summaries are generated and may contain mistakes; the official description above is the record.