{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "839585162a77ac8e9cd9b7c74c7e5ed9da785e72"
            }
          ],
          "repo": "https://github.com/kanboard/kanboard",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-qw57-7cx6-wvp7"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-203"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/52xxx/CVE-2025-52576.json"
  },
  "details": "Kanboard is project management software that focuses on the Kanban methodology. Prior to version 1.2.46, Kanboard is vulnerable to username enumeration and IP spoofing-based brute-force protection bypass. By analyzing login behavior and abusing trusted HTTP headers, an attacker can determine valid usernames and circumvent rate-limiting or blocking mechanisms. Any organization running a publicly accessible Kanboard instance is affected, especially if relying on IP-based protections like Fail2Ban or CAPTCHA for login rate-limiting. Attackers with access to the login page can exploit this flaw to enumerate valid usernames and bypass IP-based blocking mechanisms, putting all user accounts at higher risk of brute-force or credential stuffing attacks. Version 1.2.46 contains a patch for the issue.",
  "id": "CVE-2025-52576",
  "modified": "2026-04-01T23:08:49.966119802Z",
  "published": "2025-06-25T16:46:01.954Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/kanboard/kanboard/blob/cbb7e60fb595ff4572bb8801b275a0b451c4bda0/app/Model/UserLockingModel.php#L101-L104"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kanboard/kanboard/blob/cbb7e60fb595ff4572bb8801b275a0b451c4bda0/app/Subscriber/AuthSubscriber.php#L96-L108"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/52xxx/CVE-2025-52576.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/kanboard/kanboard/security/advisories/GHSA-qw57-7cx6-wvp7"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-52576"
    },
    {
      "type": "FIX",
      "url": "https://github.com/kanboard/kanboard/commit/3079623640dc39f9c7b0c840d2a79095331051f1"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Kanboard vulnerable to Username Enumeration via Login Behavior and Bruteforce Protection Bypass"
}