Sticky Ads Lightweight <= 3.3.0 - Authenticated (Administrator+) Stored Cross-Site Scripting via Ad Code Setting
- ID
- WPSEC-2026-0938
- Plugin
- Sticky Ads Lightweight (sticky-ad-lightweight)
- Affected
- all versions before 3.4.0
- Remediation
- Update to 3.4.0 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
- Weakness
- CWE-79
- Usage
- Plugin Low · Affected versions Low among sites WPSec scans, 2026-10-14
- Attack surface
- Sticky Ads Lightweight on WPSec AttackSurface
- Fix released
- Published
Description
The Sticky Ads Lightweight plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ad code setting in all versions up to, and including, 3.3.0 due to insufficient input sanitization. The sanitizer explicitly allowed <script> tags with src, async, defer and charset attributes for users without the unfiltered_html capability, and the saved code is output unescaped on the front end. This makes it possible for authenticated attackers with administrator-level access to inject arbitrary web scripts that execute whenever a user visits a page showing the sticky ad. This only affects multisite installations and installations where unfiltered_html has been disabled.
References
- https://wpsec.com/vuln/WPSEC-2026-0938/
- https://plugins.svn.wordpress.org/sticky-ad-lightweight/tags/3.4.0/
- https://wordpress.org/plugins/sticky-ad-lightweight/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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