# CVE-2026-55466: Snipe-IT: Stored XSS via inline-served attachment

> A low-privilege user can upload malicious SVG files that execute JavaScript in other users' browsers due to improper sanitization and inline serving.

- **Severity:** Medium 6.2 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA: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:** Yes
- **Published:** 10 Jul 2026
- **Updated:** 13 Jul 2026
- **Also known as:** GHSA-jhph-5q74-pmfx

## What is CVE-2026-55466?

CVE-2026-55466 is a medium-severity cross-site scripting vulnerability in Snipeitapp Snipe-It, published on 10 Jul 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

Snipe-IT is an IT asset/license management system. Prior to 8.6.2, UploadFileRequest sanitizes SVG content only when PHP finfo reports image/svg+xml and UploadedFilesController serves attachments inline without using StorageHelper::allowSafeInline(), allowing a low-privilege user to upload active XHTML or XML content that is later served same-origin and executes JavaScript in a viewer’s browser. This issue is fixed in version 8.6.2.

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

## Which versions are affected by CVE-2026-55466?

2 open source packages ship an affected version, including snipe/snipe-it. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `snipe/snipe-it` | Packagist | All versions | 8.6.2 |
| `snipe/snipe-it` | Packagist | All versions | 8.6.2 |

Products: Snipeitapp Snipe-It.

## How do I fix CVE-2026-55466?

Upgrade snipe/snipe-it to 8.6.2 or later.

## Is CVE-2026-55466 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55466 exists.

## Other vulnerabilities in Snipeitapp Snipe-It

- [CVE-2025-63601](https://insights.sbomify.com/CVE-2025-63601/): File upload in n/a (critical 9.9)
- [CVE-2026-37709](https://insights.sbomify.com/CVE-2026-37709/): Snipe-IT has insecure permissions in file uploads (critical 9.8)
- [CVE-2026-86738](https://insights.sbomify.com/CVE-2026-86738/): Snipe-IT before 8.7.0 CSS Injection via Custom CSS (critical 9.3)
- [CVE-2026-116199](https://insights.sbomify.com/CVE-2026-116199/): Snipe-IT before 8.6.3 Authentication Bypass via Google SSO Callback (critical 9.2)
- [CVE-2022-1380](https://insights.sbomify.com/CVE-2022-1380/): Stored Cross Site Scripting vulnerability in Item name parameter in snipe/snipe-it (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-55466 and fix it if it is affected.

What it is: CVE-2026-55466 is a medium-severity cross-site scripting vulnerability in Snipeitapp Snipe-It, published on 10 Jul 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55466 exists.

Affected packages and fixed versions:
- snipe/snipe-it (Packagist): affected all versions; fixed in 8.6.2
- snipe/snipe-it (Packagist): affected all versions; fixed in 8.6.2

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-2026-55466/ (Markdown: https://insights.sbomify.com/CVE-2026-55466/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-55466
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-55466
- OSV: https://osv.dev/vulnerability/CVE-2026-55466

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-55466/
Summaries are generated and may contain mistakes; the official description above is the record.