{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "nukeviet/nukeviet"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.6.00"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54064"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-13T17:54:08Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "## Summary\n\nTwo filter-bypass techniques in `NukeViet\\Core\\Request::filterAttr()` and `NukeViet\\Core\\Request::unhtmlentities()` allow a low-privileged user (any account with news post permission) to store and serve arbitrary JavaScript to any visitor of the affected page.\n\n## Affected Component\n\n`vendor/vinades/nukeviet/Core/Request.php` \u2014 class `NukeViet\\Core\\Request`\n\n## Vulnerability Details\n\n### Bypass 1 \u2014 Form Feed character prefix (`\\x0C`) before event handler name\n\nThe `filterAttr()` method blocks event-handler attributes using:\n```php\npreg_match(\u0027/^on/i\u0027, $attrSubSet[0])\n```\nPHP\u0027s `trim()` does **not** strip the ASCII Form Feed character (`\\x0C`, U+000C). An attacker can prefix the attribute name with `\\x0C` so that `\\x0Conerror` does not match `/^on/`. The HTML5 browser parser treats `\\x0C` as a valid whitespace separator and correctly activates the event handler.\n\n**Proof-of-concept payload (URL-encoded POST body field `bodyhtml`):**\n```\n\u003cimg src=\"x\" %0Conerror=\"alert(\u0027XSS\u0027)\"\u003e\n```\n\n### Bypass 2 \u2014 Decimal HTML entity tab (`\u0026#9;`) inside `javascript:` URI\n\n`unhtmlentities()` strips the hex-encoded tab `\u0026#x09;` via `str_ireplace`, but did **not** strip its decimal equivalent `\u0026#9;`. The keyword-blocking regex `/j\\s*a\\s*v\\s*a\\s*s\\s*c\\s*r\\s*i\\s*p\\s*t/si` uses `\\s*` which does not match HTML entities. The value `jav\u0026#9;ascript:alert()` passes the filter, is stored in the database, and is decoded by the browser into a working `javascript:` URI.\n\n**Proof-of-concept payload (inside a Markdown-style link):**\n```\n[Click me](jav\u0026#9;ascript:alert(\u0027XSS\u0027))\n```\n\n## Impact\n\nAn authenticated attacker with news-posting permission can inject persistent JavaScript that executes in the browser of **any user** (including administrators) who views the affected article. This enables session cookie theft, credential harvesting, defacement, and further privilege escalation.\n\n## Patches\n\nFixed in commit `\u003ccommit-sha\u003e` by modifying `vendor/vinades/nukeviet/Core/Request.php`:\n\n1. **`filterAttr()`** \u2014 strip all ASCII control characters (`\\x00`\u2013`\\x20`) from the attribute name before the `/^on/` check:\n   ```php\n   $attrSubSet[0] = preg_replace(\u0027/[\\x00-\\x20]/\u0027, \u0027\u0027, strtolower($attrSubSet[0]));\n   ```\n\n2. **`unhtmlentities()`** \u2014 strip decimal HTML entities for all ASCII control characters (0\u201331) before the keyword checks:\n   ```php\n   $value = preg_replace(\u0027/\u0026#0*(?:3[01]|[12][0-9]|[0-9]);/\u0027, \u0027\u0027, $value);\n   ```\n\n## Workarounds\n\nNone. Update to the patched version.\n\n## Resources\n\n- CWE-79: Improper Neutralization of Input During Web Page Generation (Cross-site Scripting)\n- OWASP WSTG-INPV-02: Testing for Stored Cross Site Scripting\n- [OWASP Top 10 A03:2021 \u2013 Injection](https://owasp.org/Top10/A03_2021-Injection/)",
  "id": "GHSA-465g-4q99-5x86",
  "modified": "2026-07-13T17:54:08Z",
  "published": "2026-07-13T17:54:08Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/nukeviet/nukeviet/security/advisories/GHSA-465g-4q99-5x86"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/nukeviet/nukeviet"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "NukeViet: Multiple Anti-XSS Filter Bypasses Leading to Stored XSS in News Module"
}