Flexy Breadcrumb <= 1.3.0 - Unauthenticated Reflected Cross-Site Scripting via Search Query
- ID
- WPSEC-2026-0332
- Plugin
- Flexy Breadcrumb (flexy-breadcrumb)
- Affected
- from 1.3.0 before 1.3.1
- Remediation
- Update to 1.3.1 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Weakness
- CWE-79
- Usage
- Plugin Medium · Affected versions Low among sites WPSec scans, 2026-10-22
- Attack surface
- Flexy Breadcrumb on WPSec AttackSurface
- Fix released
- Published
Description
The Flexy Breadcrumb plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the search query ('s' parameter) in version 1.3.0. The breadcrumb's JSON-LD structured data, added in 1.3.0, HTML-entity-decodes each breadcrumb name and prints it inside an inline script block without escaping '<' or '/', so a search query containing '</script>' closes the block. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. Exploitation requires the breadcrumb to be displayed on search results pages.
References
- https://wpsec.com/vuln/WPSEC-2026-0332/
- https://plugins.svn.wordpress.org/flexy-breadcrumb/tags/1.3.1/
- https://wordpress.org/plugins/flexy-breadcrumb/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
This advisory as JSON or Markdown · All advisories: JSON, RSS