CVE-2026-3481 — Cross-Site Scripting (XSS)

title: CVE-2026-3481 - WP Blockade Plugin Reflected XSS via shortcode parameter
id: scw-2026-05-22-ai-1
status: experimental
level: medium
description: |
  Detects attempts to exploit CVE-2026-3481 in the WP Blockade plugin. The vulnerability is a Reflected Cross-Site Scripting (XSS) that occurs when the 'shortcode' parameter is not properly sanitized. This rule specifically looks for the 'shortcode' parameter being passed to the 'render_shortcode_preview' function via the 'admin-post.php' endpoint, which is characteristic of this vulnerability. The presence of '<script>' within the query string indicates a potential XSS payload.
author: SCW Feed Engine (AI-generated)
date: 2026-05-22
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-3481/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: webserver
detection:
  selection:
      cs-uri-query|contains:
          - '?shortcode='
      cs-uri|contains:
          - '/wp-admin/admin-post.php'
      cs-uri-query|contains:
          - 'action=render_shortcode_preview'
  selection_base:
      cs-uri-query|contains:
          - '<script>'
  condition: selection AND selection_base
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse