# GHSA-94g8-xv23-7656: Vaadin Flow Components possible file bypass via upload validation on the server-side

> Attackers can bypass server-side upload validation in Vaadin Flow Components to upload malicious files, requiring an upgrade to fix.

- **Severity:** Not scored
- **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:** 4 Sep 2025

## What is GHSA-94g8-xv23-7656?

GHSA-94g8-xv23-7656 is a vulnerability in com.vaadin:vaadin-upload-flow, published on 4 Sep 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

### Description
When the Vaadin Upload's start listener is used to validate metadata about an incoming upload, it is possible to bypass the upload validation. Users of affected versions should apply the upgrade to a more recent Vaadin version.

## Which versions are affected by GHSA-94g8-xv23-7656?

6 open source packages ship an affected version, including com.vaadin:vaadin-upload-flow.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `com.vaadin:vaadin-upload-flow` | Maven | From 2.0.0 | 14.13.1 |
| `com.vaadin:vaadin-upload-flow` | Maven | From 2.0.0 | 14.13.1 |
| `com.vaadin:vaadin-upload-flow` | Maven | From 23.0.0 | 23.6.2 |
| `com.vaadin:vaadin-upload-flow` | Maven | From 23.0.0 | 23.6.2 |
| `com.vaadin:vaadin-upload-flow` | Maven | From 24.0.0 | 24.7.7 |
| `com.vaadin:vaadin-upload-flow` | Maven | From 24.0.0 | 24.7.7 |

## How do I fix GHSA-94g8-xv23-7656?

Upgrade com.vaadin:vaadin-upload-flow to a fixed version for your release line: 14.13.1, 23.6.2 or 24.7.7.

## Is GHSA-94g8-xv23-7656 being exploited?

There is no known exploitation of GHSA-94g8-xv23-7656 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for GHSA-94g8-xv23-7656 and fix it if it is affected.

What it is: GHSA-94g8-xv23-7656 is a vulnerability in com.vaadin:vaadin-upload-flow, published on 4 Sep 2025. 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 GHSA-94g8-xv23-7656 in the wild and no public exploit code.

Affected packages and fixed versions:
- com.vaadin:vaadin-upload-flow (Maven): affected from 2.0.0; fixed in 14.13.1
- com.vaadin:vaadin-upload-flow (Maven): affected from 2.0.0; fixed in 14.13.1
- com.vaadin:vaadin-upload-flow (Maven): affected from 23.0.0; fixed in 23.6.2
- com.vaadin:vaadin-upload-flow (Maven): affected from 23.0.0; fixed in 23.6.2
- com.vaadin:vaadin-upload-flow (Maven): affected from 24.0.0; fixed in 24.7.7
- com.vaadin:vaadin-upload-flow (Maven): affected from 24.0.0; fixed in 24.7.7

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/GHSA-94g8-xv23-7656/ (Markdown: https://insights.sbomify.com/GHSA-94g8-xv23-7656/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/GHSA-94g8-xv23-7656

---
From sbomify Insights: https://insights.sbomify.com/GHSA-94g8-xv23-7656/
Summaries are generated and may contain mistakes; the official description above is the record.