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GHSA-PCF3-JGX6-7M94

Vulnerability from github – Published: 2026-09-08 00:30 – Updated: 2026-09-08 00:30
VLAI
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.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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{
  "affected": [],
  "aliases": [
    "CVE-2026-86543"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-306"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-07T23:16:54Z",
    "severity": "CRITICAL"
  },
  "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.",
  "id": "GHSA-pcf3-jgx6-7m94",
  "modified": "2026-09-08T00:30:22Z",
  "published": "2026-09-08T00:30:22Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/knowns-dev/knowns/security/advisories/GHSA-fc85-99vc-9c75"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-86543"
    },
    {
      "type": "WEB",
      "url": "https://github.com/knowns-dev/knowns/commit/878a02cb7cc14f0a592fdfda7a520af3cac500fb"
    },
    {
      "type": "WEB",
      "url": "https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/cli/browser.go#L193-L200"
    },
    {
      "type": "WEB",
      "url": "https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/server/auth.go#L80-L86"
    },
    {
      "type": "WEB",
      "url": "https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/server/routes/tunnel.go#L26-L38"
    },
    {
      "type": "WEB",
      "url": "https://github.com/knowns-dev/knowns/releases/tag/v0.30.0"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/knowns-before-0.30.0-unauthenticated-management-api-exposure"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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