Opener Detector

Checks for window.opener vulnerabilities as you browse.

Opener Detector: Check for window.opener vulnerabilities

Opener Detector is a simple browser extension that checks for window.opener vulnerabilities while you browse. It shows a warning page in the vulnerable tab, enabling you to report or fix the vulnerability. You can add pages and domains to an ignore list, and customize reporting settings. The extension's source code is available on GitHub under the 3-clause BSD license.
Install from Chrome Web Store

Extension stats

Users: 78
-3
Rating: 5.00
(1)
Version: 1.0.0 (Last updated: 2017-09-04)
Creation date: 2017-09-03
Risk impact: Low risk impact
Risk likelihood:
Manifest version: 2
Permissions:
  • storage
Size: 30.66K

Other platforms

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Extension summary

A simple browser extension which checks for window.opener vulnerabilities as you browse. When it finds one, it shows a warning page in the vulnerable tab, so that you can report or fix the vulnerability. (Use the back button to return to the page.) Individual pages and whole domains can be added to an ignore list, and by default, vulnerabilities between pages of the same origin (e.g. https://example.com/foo.html and https://example.com/bar.html) are not reported, though this can be changed in the settings.

window.opener vulnerabilities allow Web pages to control the tab which opened them. They can be fixed on many browsers simply by adding rel=noopener to your links. For more details, check out Mathias Bynens' article (https://mathiasbynens.github.io/rel-noopener/).

Please use responsibly. Disclose vulnerabilities you find, or fix them. Keep your hat white.

Source code is available on GitHub (https://github.com/HarryCutts/opener-detector), under the 3-clause BSD license. Contributions welcome!

Extension safety

Risk impact

Opener Detector requires very minimum permissions.

Risk likelihood

Opener Detector has earned a good reputation and can be trusted.

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