codex - 💡(How to fix) Fix browser-use (browser-client.mjs) marked as trojan by Windows Defender [7 comments, 8 participants]

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openai/codex#20315Fetched 2026-05-01 05:44:05
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What version of the Codex App are you using (From “About Codex” dialog)?

26.422.71525

What subscription do you have?

plus

What platform is your computer?

Microsoft Windows NT 10.0.26100.0 x64

What issue are you seeing?

Request to open google.com with browser use skill is blocked by Windows Defender, showing that file: C:\Users\***\.codex\plugins\cache\openai-bundled\browser-use\0.1.0-alpha1\scripts\browser-client.mjs contains Trojan:JS/DrillApp.A!MTB

What steps can reproduce the bug?

<img width="269" height="44" alt="Image" src="https://github.com/user-attachments/assets/f9816c30-f827-4ad0-8bd3-1a13c237e2c1" />

What is the expected behavior?

No response

Additional information

No response

extent analysis

TL;DR

The issue is likely due to a false positive detection by Windows Defender, and a workaround may involve whitelisting the browser-client.mjs file or updating the Codex App to a version with a resolved security signature.

Guidance

  • Verify the file browser-client.mjs is not malicious by checking its digital signature or scanning it with another antivirus tool.
  • Consider whitelisting the C:\Users\***\.codex\plugins\cache\openai-bundled\browser-use\0.1.0-alpha1\scripts directory in Windows Defender to prevent false positives.
  • Check if there are any updates available for the Codex App that may address this issue.
  • If the issue persists, try disabling Windows Defender temporarily to see if the problem is indeed caused by the antivirus software.

Notes

The provided information does not include any code or specific details about the browser-client.mjs file, so it's difficult to determine the root cause of the issue. The solution may vary depending on the actual contents of the file and the version of the Codex App.

Recommendation

Apply workaround: Whitelist the browser-client.mjs file or the containing directory in Windows Defender, as this is a more immediate and targeted solution than waiting for a potential update to the Codex App.

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codex - 💡(How to fix) Fix browser-use (browser-client.mjs) marked as trojan by Windows Defender [7 comments, 8 participants]