CVE-2026-86543
critical · 9.3knowns 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.
9.3
CVSS
0.9%
EPSS (exploit prob.)
58th
EPSS percentile
2026-09-07
Published
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weaknesses
CWE-306
References
- 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/auth.go#L80-L86
- 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://github.com/knowns-dev/knowns/security/advisories/GHSA-fc85-99vc-9c75
- https://www.vulncheck.com/advisories/knowns-before-0.30.0-unauthenticated-management-api-exposure
Query this programmatically:
curl https://evil-db.io/api/v1/cve/CVE-2026-86543