Vulnerabilities / better-block-editor / WPSEC-2026-3004
better-block-editor <= 1.8.1 - Missing Authorization to Authenticated (Subscriber+) Theme Activation
Medium 4.3
CWE-862Fixed in 1.8.2
- ID
- WPSEC-2026-3004
- Plugin
- better-block-editor (better-block-editor)
- Affected
- all versions before 1.8.2
- Remediation
- Update to 1.8.2 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, 2026-11-12
- Attack surface
- better-block-editor on WPSec AttackSurface
- Fix released
- Published
Description
The better-block-editor plugin for WordPress is vulnerable to unauthorized modification of data via the 'wpbbe_install_bb_theme' AJAX action in all versions up to, and including, 1.8.1, due to a missing capability check and missing nonce verification in the ThemeInstallAjaxHandler::install_theme() function. This makes it possible for authenticated attackers, with Subscriber-level access and above, to switch the site's active theme to Better Block Theme when that theme is installed but not active.
References
- https://wpsec.com/vuln/WPSEC-2026-3004/
- https://plugins.svn.wordpress.org/better-block-editor/tags/1.8.2/
- https://wordpress.org/plugins/better-block-editor/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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