Critical 9.8Published Sep 7, 2026

CVE-2026-86543knowns before 0.30.0 Unauthenticated Management API Exposure

Updated under an hour ago (2026-10-19 08:30 UTC)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for knowns-dev knowns

Exploited in the last 30 days

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.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-306
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Sep 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

knowns-dev knowns knowns_dev:knowns (from the name)	before 0.30.0; 0.30.0 not affected	CNA record

References

https://github.com/knowns-dev/knowns/security/advisories/GHSA-fc85-99vc-9c75vendor-advisory
https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/server/auth.go#L80-L86technical-description
https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/cli/browser.go#L193-L200technical-description
https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/server/routes/tunnel.go#L26-L38technical-description
https://github.com/knowns-dev/knowns/commit/878a02cb7cc14f0a592fdfda7a520af3cac500fbpatch
https://github.com/knowns-dev/knowns/releases/tag/v0.30.0release-notes
https://www.vulncheck.com/advisories/knowns-before-0.30.0-unauthenticated-management-api-exposurethird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.