# CVE-2025-9096: ExpressGateway express-gateway REST Endpoint apps.js cross site scripting

> Remote attackers can execute arbitrary scripts via cross-site scripting in the ExpressGateway REST endpoint, potentially compromising user sessions.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P`)
- **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:** 17 Aug 2025
- **Updated:** 18 Aug 2025
- **Also known as:** GHSA-xfp8-x3j6-h67v

## What is CVE-2025-9096?

CVE-2025-9096 is a medium-severity cross-site scripting vulnerability in ExpressGateway express-gateway, published on 17 Aug 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

A vulnerability has been found in ExpressGateway express-gateway up to 1.16.10. Affected is an unknown function in the library lib/rest/routes/apps.js of the component REST Endpoint. The manipulation leads to cross site scripting. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2025-9096?

2 open source packages ship an affected version, including express-gateway.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `express-gateway` | npm | All versions to 1.16.10 | None |
| `express-gateway` | npm | All versions to 1.16.10 | None |

## How do I fix CVE-2025-9096?

No fix has been published for CVE-2025-9096 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-9096 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-9096 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-9096 and fix it if it is affected.

What it is: CVE-2025-9096 is a medium-severity cross-site scripting vulnerability in ExpressGateway express-gateway, published on 17 Aug 2025. 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-2025-9096 exists.

Affected packages and fixed versions:
- express-gateway (npm): affected all versions up to 1.16.10; no fix listed
- express-gateway (npm): affected all versions up to 1.16.10; no fix listed

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-2025-9096/ (Markdown: https://insights.sbomify.com/CVE-2025-9096/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-9096
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-9096
- OSV: https://osv.dev/vulnerability/CVE-2025-9096

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-9096/
Summaries are generated and may contain mistakes; the official description above is the record.