# CVE-2026-27600: HomeBox affected by Blind SSRF

> Authenticated users can exploit the notifier feature to perform blind SSRF, enabling internal service enumeration via network state side-channels.

- **Severity:** Medium 5.0 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/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:** 3 Mar 2026
- **Updated:** 4 Mar 2026
- **Also known as:** GHSA-cm7p-5mg5-82pm

## What is CVE-2026-27600?

CVE-2026-27600 is a medium-severity server-side request forgery vulnerability in sysadminsmedia homebox, published on 3 Mar 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 0.24.0-rc.1, the notifier functionality allows authenticated users to specify arbitrary URLs to which the application sends HTTP POST requests. No validation or restriction is applied to the supplied host, IP address, or port. Although the application does not return the response body from the target service, its UI behavior differs depending on the network state of the destination. This creates a behavioral side-channel that enables internal service enumeration. This vulnerability is fixed in 0.24.0-rc.1.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2026-27600?

It affects 1 product.


Products: Sysadminsmedia Homebox.

## How do I fix CVE-2026-27600?

No fix has been published for CVE-2026-27600 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-27600 being exploited?

There is no known exploitation of CVE-2026-27600 in the wild and no public exploit code.

## Other vulnerabilities in sysadminsmedia homebox

- [CVE-2026-40196](https://insights.sbomify.com/CVE-2026-40196/): HomeBox has Unauthorized API Access via Retained defaultGroup ID After Group Access Revocation (high 8.1)
- [CVE-2026-27981](https://insights.sbomify.com/CVE-2026-27981/): HomeBox has an Auth Rate Limit Bypass via IP Spoofing (high 7.4)
- [CVE-2026-26272](https://insights.sbomify.com/CVE-2026-26272/): HomeBox affected by Stored XSS via HTML/SVG Attachment Upload (medium 4.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-27600 and fix it if it is affected.

What it is: CVE-2026-27600 is a medium-severity server-side request forgery vulnerability in sysadminsmedia homebox, published on 3 Mar 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-2026-27600 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-2026-27600/ (Markdown: https://insights.sbomify.com/CVE-2026-27600/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-27600
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27600
- OSV: https://osv.dev/vulnerability/CVE-2026-27600

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-27600/
Summaries are generated and may contain mistakes; the official description above is the record.