CVE-2026-86543

Summary

knowns versions before 0.30.0 serve the management API without authentication on all network interfaces by default, with no password required on fresh installations. Attackers can access the unauthenticated /api/tunnel/start endpoint to provision a public tunnel and republish the API at a publicly accessible address.

Affected Software

Weaknesses

• CWE-306: Missing Authentication for Critical Function

References

• https://github.com/knowns-dev/knowns/security/advisories/GHSA-fc85-99vc-9c75
• https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/server/auth.go#L80-L86
• https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/cli/browser.go#L193-L200
• https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/server/routes/tunnel.go#L26-L38
• https://github.com/knowns-dev/knowns/commit/878a02cb7cc14f0a592fdfda7a520af3cac500fb
• https://github.com/knowns-dev/knowns/releases/tag/v0.30.0
• https://www.vulncheck.com/advisories/knowns-before-0.30.0-unauthenticated-management-api-exposure

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