CVE-2026-6378 — Cross-Site Scripting (XSS)
CVE-2026-6378 — The Maxi Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `/wp-json/maxi-blocks/v1.0/style-card` REST API endpoint in all versions up to, and including, 2.1.9 due to insufficient input sanitization and output escaping of the `sc_styles` parameter. This
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-2026-6378 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.
WordPress Maxi Blocks Stored XSS via style-card API - CVE-2026-6378
title: WordPress Maxi Blocks Stored XSS via style-card API - CVE-2026-6378
id: scw-2026-05-02-ai-1
status: experimental
level: high
description: |
Detects the specific REST API endpoint and parameter used in CVE-2026-6378 for Stored Cross-Site Scripting. This rule targets the vulnerability in the Maxi Blocks plugin where unsanitized input in the 'sc_styles' parameter allows for script injection.
author: SCW Feed Engine (AI-generated)
date: 2026-05-02
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-6378/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/wp-json/maxi-blocks/v1.0/style-card'
cs-uri-query|contains:
- 'sc_styles='
cs-method:
- 'POST'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-6378 | vulnerability | CVE-2026-6378 |
| CWE-79 | weakness | CWE-79 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 02, 2026 at 07:16 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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