CVE-2026-86543

    Dashboard / Vulnerabilities / CVE-2026-86543

    CVE-2026-86543

    Published: 7 Sept 2026Last Modified: 12 Sept 2026

    Summary: knowns before 0.30.0 Unauthenticated Management API Exposure

    Details: 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.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86543.json, https://github.com/knowns-dev/knowns/releases/tag/v0.30.0, https://github.com/knowns-dev/knowns/security/advisories/GHSA-fc85-99vc-9c75, https://nvd.nist.gov/vuln/detail/CVE-2026-86543, https://www.vulncheck.com/advisories/knowns-before-0.30.0-unauthenticated-management-api-exposure, https://github.com/knowns-dev/knowns/commit/878a02cb7cc14f0a592fdfda7a520af3cac500fb, 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

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -cead30b2c3a34f66c0c40cb692ed51e588e63bd7

    Affected versions

    v0.29.1
    v0.29.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-86543 | CVE-DB