ExpressGateway Cross-Site Scripting Vulnerability in lib/rest/routes/users.js

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

5.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N · score source

EPSS

• CVE-2025-9095: 0.27% estimated exploitation activity in the next 30 days; percentile 19.12 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

A cross-site scripting (XSS) issue exists in ExpressGateway up to 1.16.10 in the REST endpoint implemented in lib/rest/routes/users.js. User-controlled input is reflected into the HTTP response without proper sanitization, allowing arbitrary JavaScript execution in the browser of a logged-in user who views the affected page/route. The attack can be triggered over the network with low complexity and requires a low-privileged authenticated context and user interaction (viewing the page). Impact is limited to confidentiality and integrity of the session in the affected UI.

Published by the source

18 Aug 2025, 00:30 UTC

Last modified by the source

23 Sep 2025, 20:30 UTC

Source last checked

26 Oct 2026, 12:38 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-q4rg-7cjj-5r86

2. Revision 2 · amended · 25 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-q4rg-7cjj-5r86

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# Patch Next advisory brief: CVE-2025-9095

Advisory: ExpressGateway Cross-Site Scripting Vulnerability in lib/rest/routes/users.js
IDs: CVE-2025-9095, GHSA-q4rg-7cjj-5r86
Record: https://patchnext.com/advisories/cve-2025-9095 (revision 3, source checked 26 Oct 2026, 12:38 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm express-gateway: affected <= 1.16.10

## Suggested inspection (read-only)
- `npm ls express-gateway --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on express-gateway.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-q4rg-7cjj-5r86 (OSV record GHSA-q4rg-7cjj-5r86 lists affected ranges: npm express-gateway >=0 <=1.16.10)
- Verified: https://github.com/advisories/GHSA-q4rg-7cjj-5r86 (GitHub-reviewed advisory GHSA-q4rg-7cjj-5r86 lists affected ranges: npm express-gateway >=0 <=1.16.10)

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