GHSA-P68C-RMFH-J48H

Vulnerability from github – Published: 2026-03-24 15:30 – Updated: 2026-03-26 18:38
VLAI?
Summary
ConcreteCMS is vulnerable to Denial of Service During Bulk Downloads
Details

ConcreteCMS v9.4.7 contains a Denial of Service (DoS) vulnerability in the File Manager component. The 'download' method in 'concrete/controllers/backend/file.php' improperly manages memory when creating zip archives. It uses 'ZipArchive::addFromString' combined with 'file_get_contents', which loads the entire content of every selected file into PHP memory. An authenticated attacker can exploit this by requesting a bulk download of large files, triggering an Out-Of-Memory (OOM) condition that causes the PHP-FPM process to terminate (SIGSEGV) and the web server to return a 500 error.

Severity ?
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "concrete5/concrete5"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "9.4.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-30662"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-26T18:38:46Z",
    "nvd_published_at": "2026-03-24T15:16:34Z",
    "severity": "MODERATE"
  },
  "details": "ConcreteCMS v9.4.7 contains a Denial of Service (DoS) vulnerability in the File Manager component. The \u0027download\u0027 method in \u0027concrete/controllers/backend/file.php\u0027 improperly manages memory when creating zip archives. It uses \u0027ZipArchive::addFromString\u0027 combined with \u0027file_get_contents\u0027, which loads the entire content of every selected file into PHP memory. An authenticated attacker can exploit this by requesting a bulk download of large files, triggering an Out-Of-Memory (OOM) condition that causes the PHP-FPM process to terminate (SIGSEGV) and the web server to return a 500 error.",
  "id": "GHSA-p68c-rmfh-j48h",
  "modified": "2026-03-26T18:38:46Z",
  "published": "2026-03-24T15:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-30662"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/concretecms/concretecms"
    },
    {
      "type": "WEB",
      "url": "https://wang1rrr.github.io/2026/02/11/CVE-Report-ConcreteCMS-DoS"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ConcreteCMS is vulnerable to Denial of Service During Bulk Downloads"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.