# CVE-2026-26272: HomeBox affected by Stored XSS via HTML/SVG Attachment Upload

> An authenticated user can upload malicious HTML or SVG files to HomeBox, leading to stored XSS execution in other users' browsers.

- **Severity:** Medium 4.6 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/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:** A user has to click or open something
- **Fix available:** No
- **Published:** 3 Mar 2026
- **Updated:** 4 Mar 2026
- **Also known as:** GHSA-55fv-9q6q-vpcr

## What is CVE-2026-26272?

CVE-2026-26272 is a medium-severity cross-site scripting vulnerability in sysadminsmedia homebox, published on 3 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

HomeBox is a home inventory and organization system. Prior to 0.24.0-rc.1, a stored cross-site scripting (XSS) vulnerability exists in the item attachment upload functionality. The application does not properly validate or restrict uploaded file types, allowing an authenticated user to upload malicious HTML or SVG files containing executable JavaScript (also, potentially other formats that render scripts). Uploaded attachments are accessible via direct links. When a user accesses such a file in their browser, the embedded JavaScript executes in the context of the application's origin. This vulnerability is fixed in 0.24.0-rc.1.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-26272?

It affects 1 product.


Products: Sysadminsmedia Homebox.

## How do I fix CVE-2026-26272?

No fix has been published for CVE-2026-26272 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-26272 being exploited?

There is no known exploitation of CVE-2026-26272 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-2026-27600](https://insights.sbomify.com/CVE-2026-27600/): HomeBox affected by Blind SSRF (medium 5.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-26272 and fix it if it is affected.

What it is: CVE-2026-26272 is a medium-severity cross-site scripting vulnerability in sysadminsmedia homebox, published on 3 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-26272 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-2026-26272/ (Markdown: https://insights.sbomify.com/CVE-2026-26272/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-26272
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-26272
- OSV: https://osv.dev/vulnerability/CVE-2026-26272

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-26272/
Summaries are generated and may contain mistakes; the official description above is the record.