Flexy Breadcrumb <= 1.3.0 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Display Name
- ID
- WPSEC-2026-0333
- 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:L/UI:N/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 Stored Cross-Site Scripting via the user display name in version 1.3.0. On author archive pages the display name is HTML-entity-decoded and printed inside the breadcrumb's inline JSON-LD script block without escaping '<' or '/', so a display name containing an encoded '</script>' sequence closes the block. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses the attacker's author archive page. Exploitation requires the breadcrumb to be displayed on author archive pages.
References
- https://wpsec.com/vuln/WPSEC-2026-0333/
- 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.
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