CVE-2026-86543 Details
Description
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.
A vulnerability exists in Knowns versions prior to 0.30.0, where the management API is exposed without authentication on all network interfaces by default. Fresh installations do not require a password, allowing attackers to access the /api/tunnel/start endpoint. This endpoint can be used to create a public tunnel that republishes the management API at a publicly accessible address, effectively bypassing local firewall or NAT protections.
Upgrade to Knowns version 0.30.0 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 7, 2026CISA-ADP
Assessed Sep 14, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-306 | Missing Authentication for Critical Function | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Knowns | <= 0.29.1 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 14, 2026 | CVE Modified | CISA-ADP |
| Sep 7, 2026 | New CVE Received | [email protected] |