Hummingbird – Speed Optimization, Caching, Minify, Compress & CDN <= 3.21.2 - Authenticated (Author+) Missing Authorization to Asset Optimization Settings Update and CDN Toggle
- ID
- WPSEC-2026-2453
- Plugin
- Hummingbird Performance – Cache & Page Speed Optimization for Core Web Vitals | Critical CSS | Minify CSS | Defer CSS Javascript | CDN (hummingbird-performance)
- Affected
- from 3.4.0 before 4.0.0
- Remediation
- Update to 4.0.0 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- Weakness
- CWE-862
- Usage
- Plugin Low · Affected versions Low among sites WPSec scans, 2026-11-04
- Attack surface
- Hummingbird – Speed Optimization, Caching, Minify, Compress & CDN on WPSec AttackSurface
- Fix released
- Published
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.
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/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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