{
  "cveId": "CVE-2026-21881",
  "url": "https://patchblox.com/security/cve/CVE-2026-21881",
  "summary": "CVE-2026-21881 is fixed in kanboard on 1 platform by DEBIAN-CVE-2026-21881 (version 1.2.49\u002Bds-1), released January 8, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "kanboard: Kanboard is project management software focused on Kanban methodology",
  "description": "Kanboard is project management software focused on Kanban methodology. Versions 1.2.48 and below is vulnerable to a critical authentication bypass when REVERSE_PROXY_AUTH is enabled. The application blindly trusts HTTP headers for user authentication without verifying the request originated from a trusted reverse proxy. An attacker can impersonate any user, including administrators, by simply sending a spoofed HTTP header. This issue is fixed in version 1.2.49.",
  "published": "2026-01-08T02:15:53Z",
  "severity": "critical",
  "cvss": 9.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
  "epss": 0.00486,
  "epssPercentile": 0.42155,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "kanboard",
      "release": "Debian 14",
      "fixedVersion": "1.2.49\u002Bds-1",
      "fix": "DEBIAN-CVE-2026-21881",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-21881",
      "released": "2026-01-08T02:15:53Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}