[GH-ISSUE #4188] Security issue: oauth client secret is passed to frontend #8229

New Issue

saavagebueno · 2026-08-05T01:16:58-04:00

saavagebueno commented

2026-08-05 01:16:58 -04:00

Originally created by @AbsurdlySuspicious on GitHub (Jul 21, 2025).
Original GitHub issue: https://github.com/netbirdio/netbird/issues/4188

Describe the problem

Oauth client secret is embedded in frontend package of netbird (dashboard) within js chunks, and requests to oauth token endpoint are performed from frontend for some reason which also exposes client_secret in network tab

To Reproduce

Steps to reproduce the behavior:

Setup selfhosted netbird according to official guide
Go to netbird domain you've set up and open network tab in devtools

Expected behavior

Authorization code from oauth redirect is passed to backend and actual request to token endpoint happens on backend, client_secret is not exposed to browser

Are you using NetBird Cloud?

Self-hosted

NetBird version

0.51.1

Is any other VPN software installed?

No

Debug output

N/A

Screenshots

N/A

Additional context

N/A

Have you tried these troubleshooting steps?

Reviewed client troubleshooting (if applicable)
Checked for newer NetBird versions
Searched for similar issues on GitHub (including closed ones)
Restarted the NetBird client
Disabled other VPN software
Checked firewall settings

Originally created by @AbsurdlySuspicious on GitHub (Jul 21, 2025). Original GitHub issue: https://github.com/netbirdio/netbird/issues/4188 **Describe the problem** Oauth client secret is embedded in frontend package of netbird (dashboard) within js chunks, and requests to oauth token endpoint are performed from frontend for some reason which also exposes client_secret in network tab **To Reproduce** Steps to reproduce the behavior: 1. Setup selfhosted netbird according to official guide 2. Go to netbird domain you've set up and open network tab in devtools **Expected behavior** Authorization code from oauth redirect is passed to backend and actual request to token endpoint happens on backend, client_secret is not exposed to browser **Are you using NetBird Cloud?** Self-hosted **NetBird version** `0.51.1` **Is any other VPN software installed?** No **Debug output** N/A **Screenshots** N/A **Additional context** N/A **Have you tried these troubleshooting steps?** - [x] Reviewed [client troubleshooting](https://docs.netbird.io/how-to/troubleshooting-client) (if applicable) - [x] Checked for newer NetBird versions - [x] Searched for similar issues on GitHub (including closed ones) - [x] Restarted the NetBird client - [x] Disabled other VPN software - [x] Checked firewall settings

saavagebueno added the security triage-needed self-hosting labels 2026-08-05 01:16:58 -04:00

saavagebueno commented

2026-08-05 01:16:58 -04:00

@sk-shakeel commented on GitHub (Aug 26, 2025):

Addon: To reproduce the issue, search "authClientSecret" in the network tab.

Also Its only in case if your provider is Google Workspace.

@sk-shakeel commented on GitHub (Aug 26, 2025): **Addon:** To reproduce the issue, search "authClientSecret" in the network tab. Also Its only in case if your provider is Google Workspace.

saavagebueno commented

2026-08-05 01:16:59 -04:00

@AbsurdlySuspicious commented on GitHub (Mar 18, 2026):

Bumping this issue. There have been some developments in auth flow as far as I can see, but this is still not solved. Any requests containing client_secret or idP`s access_token should be proxied through management service (or new service separated from management).

@AbsurdlySuspicious commented on GitHub (Mar 18, 2026): Bumping this issue. There have been some developments in auth flow as far as I can see, but this is still not solved. Any requests containing `client_secret` or idP\`s `access_token` should be proxied through management service (or new service separated from management).

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dependabot/github_actions/actions-a940c7c866

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notification-localization

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fix/relay-proxy-redirect-when-ice-active

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dependabot/npm_and_yarn/proxy/web/npm_and_yarn-b39864987c

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revert/component-types-hookup

feature/ios-ssh

docs/agent-network-docs-update

dependabot/go_modules/github.com/aws/aws-sdk-go-v2/service/s3-1.106.3

dependabot/go_modules/github.com/pion/stun/v3-3.1.5

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dependabot/go_modules/goauthentik.io/api/v3-3.2026050.6

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dependabot/go_modules/github.com/oapi-codegen/runtime-1.6.0

dependabot/go_modules/github.com/eko/gocache/lib/v4-4.2.4

dependabot/go_modules/github.com/pkg/sftp-1.13.11

dependabot/go_modules/github.com/coreos/go-oidc/v3-3.20.0

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Reference: DYNR/netbird#8229