CVE-2026-4859 — Cross-Site Scripting (XSS)
CVE-2026-4859 — The SP Blog Designer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'design' attribute of the `wpsbd_post_carousel` shortcode in all versions up to, and including, 1.0.0 due to insufficient input sanitization and output escaping. This makes it possible for
What This Means For You
- If your environment is affected by CWE-79, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-4859 updates and patches.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-4859 - SP Blog Designer Stored XSS via wpsbd_post_carousel shortcode
title: CVE-2026-4859 - SP Blog Designer Stored XSS via wpsbd_post_carousel shortcode
id: scw-2026-05-12-ai-1
status: experimental
level: high
description: |
Detects the exploitation of CVE-2026-4859 in the SP Blog Designer WordPress plugin. This rule specifically looks for the 'wpsbd_post_carousel' shortcode being used with the 'design' attribute containing script tags, indicating a Stored Cross-Site Scripting (XSS) attempt. This allows unauthenticated or low-privileged users to inject malicious scripts into WordPress pages.
author: SCW Feed Engine (AI-generated)
date: 2026-05-12
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-4859/
tags:
- attack.initial_access
- attack.t1189
logsource:
category: webserver
detection:
selection:
cs-uri-query|contains:
- 'wpsbd_post_carousel'
cs-uri-query|contains:
- 'design='
cs-uri-query|contains:
- '<script>'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-4859 | vulnerability | CVE-2026-4859 |
| CWE-79 | weakness | CWE-79 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 12, 2026 at 12:16 UTC |
This content was curated and summarized by Shimi's Cyber World for informational purposes. It is not copied or republished in full. All intellectual property rights remain with the original author and source.
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