Vulnerabilities / Nexter Blocks / WPSEC-2026-1578
Nexter Blocks <= 5.0.7 - Authenticated (Contributor+) Stored Cross-Site Scripting via Countdown Block Expiry Redirect URL
Medium 4.9
CWE-79Fixed in 5.0.8
- ID
- WPSEC-2026-1578
- Plugin
- Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder (the-plus-addons-for-block-editor)
- Affected
- all versions before 5.0.8
- Remediation
- Update to 5.0.8 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N
- Weakness
- CWE-79
- Usage
- Plugin Low · Affected versions Low among sites WPSec scans, 2026-10-23
- Attack surface
- Nexter Blocks on WPSec AttackSurface
- Fix released
- Published
Description
The Nexter Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Countdown block's expiry redirect URL in all versions up to, and including, 5.0.7, due to insufficient input sanitization. The redirect URL was passed unsanitized to a client-side redirect that runs when the countdown expires, which accepts javascript: URLs. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute when the countdown expires while a user is viewing an injected page.
References
- https://wpsec.com/vuln/WPSEC-2026-1578/
- https://plugins.svn.wordpress.org/the-plus-addons-for-block-editor/tags/5.0.8/
- https://wordpress.org/plugins/the-plus-addons-for-block-editor/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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