{
 "id": "WPSEC-2026-2453",
 "url": "https://wpsec.com/vuln/WPSEC-2026-2453/",
 "json_url": "https://wpsec.com/vuln/WPSEC-2026-2453/advisory.json",
 "markdown_url": "https://wpsec.com/vuln/WPSEC-2026-2453/index.md",
 "title": "Hummingbird – Speed Optimization, Caching, Minify, Compress & CDN <= 3.21.2 - Authenticated (Author+) Missing Authorization to Asset Optimization Settings Update and CDN Toggle",
 "description": "The Hummingbird Performance plugin for WordPress is vulnerable to unauthorized modification of data via the wphb_react_minify_manual_save_settings and wphb_react_minify_toggle_cdn AJAX actions in all versions up to, and including, 3.21.2, due to a missing capability check on the minify_manual_save_settings() and minify_toggle_cdn() functions, which only verify the 'wphb-fetch' nonce. That nonce is also printed in the block editor for published posts. This makes it possible for authenticated attackers with Author-level access and above to overwrite the plugin's manual Asset Optimization settings, such as per-file minify, combine, defer and don't-load options, and to turn the CDN on or off, which also clears the minified asset files.",
 "plugin": {
  "slug": "hummingbird-performance",
  "name": "Hummingbird – Speed Optimization, Caching, Minify, Compress & CDN",
  "full_name": "Hummingbird Performance – Cache & Page Speed Optimization for Core Web Vitals | Critical CSS | Minify CSS | Defer CSS Javascript | CDN",
  "wordpress_org": "https://wordpress.org/plugins/hummingbird-performance/",
  "advisories_url": "https://wpsec.com/vuln/plugin/hummingbird-performance/",
  "attacksurface": "https://attacksurface.wpsec.com/plugin/hummingbird-performance"
 },
 "type": "NO AUTHORISATION",
 "cwe": [
  "CWE-862"
 ],
 "cve": [],
 "cvss": {
  "version": "3.1",
  "score": 4.3,
  "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
  "severity": "Medium"
 },
 "affected": {
  "ranges": [
   {
    "from": "3.4.0",
    "from_inclusive": true,
    "to": "4.0.0",
    "to_inclusive": false
   }
  ],
  "text": [
   "from 3.4.0 before 4.0.0"
  ]
 },
 "introduced_in": "3.4.0",
 "fixed_in": "4.0.0",
 "remediation": "Update to 4.0.0 or later.",
 "fix_released": "2026-11-03T08:01:34+00:00",
 "published": "2026-11-04T08:47:45+00:00",
 "updated": "2026-11-03T13:22:30.283233+00:00",
 "also_published_as": null,
 "references": [
  "https://wpsec.com/vuln/WPSEC-2026-2453/",
  "https://plugins.svn.wordpress.org/hummingbird-performance/tags/4.0.0/",
  "https://wordpress.org/plugins/hummingbird-performance/"
 ],
 "attacksurface_url": "https://attacksurface.wpsec.com/plugin/hummingbird-performance",
 "source": "WPSec",
 "license": {
  "name": "CC BY 4.0",
  "url": "https://creativecommons.org/licenses/by/4.0/"
 },
 "usage": {
  "plugin": "Low",
  "affected_versions": "Low",
  "as_of": "2026-11-04"
 }
}