{"id":"CVE-2026-86543","title":"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","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 …","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-306"],"vendor":"knowns-dev","product":"knowns","affected":["knowns < 0.30.0"],"published":"2026-09-07","updated":"2026-09-14","sourceUpdated":"2026-09-14T20:17:01.263","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-86543","references":[{"url":"https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/cli/browser.go#L193-L200","label":"disclosure@vulncheck.com"},{"url":"https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/server/auth.go#L80-L86","label":"disclosure@vulncheck.com"},{"url":"https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/server/routes/tunnel.go#L26-L38","label":"disclosure@vulncheck.com"},{"url":"https://github.com/knowns-dev/knowns/commit/878a02cb7cc14f0a592fdfda7a520af3cac500fb","label":"disclosure@vulncheck.com"},{"url":"https://github.com/knowns-dev/knowns/releases/tag/v0.30.0","label":"disclosure@vulncheck.com"},{"url":"https://github.com/knowns-dev/knowns/security/advisories/GHSA-fc85-99vc-9c75","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/knowns-before-0.30.0-unauthenticated-management-api-exposure","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"epss":0.00856,"epssPercentile":0.5664,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-09-14T19:22:17.717841Z"},"ingestedAt":"2026-09-08T15:33:26.980Z","slug":"CVE-2026-86543","body":"## Overview\n\nknowns 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}