GHSA-8559-GWJ3-Q37R

Vulnerability from github – Published: 2026-07-14 19:51 – Updated: 2026-07-14 19:51
VLAI
Summary
EasyAdmin: Stored Cross-Site Scripting (XSS) via uploaded files served inline in FileField and ImageField
Details

EasyAdmin's FileField and ImageField accept browser-executable file types by default (FileField applies no MIME/extension restrictions; ImageField's default Image constraint accepts SVG). When the upload directory is configured inside the public web root — as shown in the documentation — EasyAdmin links to the stored file inline (no download attribute or Content-Disposition: attachment).

An attacker with access to a form using these fields can upload an .html (FileField) or .svg (ImageField) file containing JavaScript. When another user opens it from the backend, it is served from the same origin and the script executes in the context of their authenticated admin session, enabling session/CSRF-token theft or privilege escalation.

Exploitation requires the developer to store uploads in the public directory and a privilege gap between the uploading user and the viewing administrator. This is stored XSS only — it does not allow remote code execution, because uploaded filenames are derived from Symfony's guessExtension(), which never produces .php/.phtml.

Credit

We would like to thank Emre Dogan for reporting the issue.

Severity
7.6 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "easycorp/easyadmin-bundle"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0"
            },
            {
              "fixed": "5.0.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54087"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-434",
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-14T19:51:34Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "EasyAdmin\u0027s `FileField` and `ImageField` accept browser-executable file types by default (`FileField` applies no MIME/extension restrictions; `ImageField`\u0027s default `Image` constraint accepts SVG). When the upload directory is configured inside the public web root \u2014 as shown in the documentation \u2014 EasyAdmin links to the stored file inline (no download attribute or `Content-Disposition: attachment`).\n\nAn attacker with access to a form using these fields can upload an `.html` (`FileField`) or `.svg` (`ImageField`) file containing JavaScript. When another  user opens it from the backend, it is served from the same origin and the script executes in the context of their authenticated admin session, enabling session/CSRF-token theft or privilege escalation.\n\nExploitation requires the developer to store uploads in the public directory and a privilege gap between the uploading user and the viewing administrator. This is stored XSS only \u2014 it does not allow remote code execution, because uploaded filenames are derived from Symfony\u0027s `guessExtension()`, which never produces `.php`/`.phtml`.\n\nCredit\n\nWe would like to thank Emre Dogan for reporting the issue.",
  "id": "GHSA-8559-gwj3-q37r",
  "modified": "2026-07-14T19:51:35Z",
  "published": "2026-07-14T19:51:34Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/EasyCorp/EasyAdminBundle/security/advisories/GHSA-8559-gwj3-q37r"
    },
    {
      "type": "WEB",
      "url": "https://github.com/EasyCorp/EasyAdminBundle/commit/8132b2b0ca3876c9261264fa267106a1b2c10a68"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/EasyCorp/EasyAdminBundle"
    },
    {
      "type": "WEB",
      "url": "https://github.com/EasyCorp/EasyAdminBundle/releases/tag/v5.0.13"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "EasyAdmin: Stored Cross-Site Scripting (XSS) via uploaded files served inline in FileField and ImageField"
}



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