CVE-2026-86543 knowns before 0.30.0 Unauthenticated Management API Exposure
Attackers can access the unauthenticated management API to provision public tunnels, exposing internal services to the internet.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-86543?
CVE-2026-86543 is a critical missing authorization vulnerability in knowns-dev knowns, published on 7 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-306
Which versions are affected by CVE-2026-86543?
How do I fix CVE-2026-86543?
No fix has been published for CVE-2026-86543 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-86543 being exploited?
There is no known exploitation of CVE-2026-86543 in the wild and no public exploit code.
Sources
Also known as GHSA-fc85-99vc-9c75, GHSA-pcf3-jgx6-7m94.