CVE-2026-18488— Blocksy Companion <= 2.1.51 - Authenticated (Author+) Stored Cross-Site Scripting via 'tagName' Block Attribute (blocksy/dynamic-data)
Quick assessment
Affected
creativethemeshq Blocksy Companion
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
WordPress 的 Blocksy Companion 插件存在存储型跨站脚本攻击（Stored XSS）漏洞，该漏洞源于 块属性（ ）中输入净化不足和输出转义不当。此漏洞影响 2.1.51 及之前所有版本。拥有作者（author）级别及以上权限的认证攻击者可以利用该漏洞，在页面中注入任意 Web 脚本；当用户访问被注入的页面时，这些脚本将被执行。
Possible ATT&CK Techniques 1 AI
T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-18488
Vulnerability Information
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Vulnerability Title
Blocksy Companion <= 2.1.51 - Authenticated (Author+) Stored Cross-Site Scripting via 'tagName' Block Attribute (blocksy/dynamic-data)
Source: CVE Program / CVE List V5
Vulnerability Description
The Blocksy Companion plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'tagName' Block Attribute (blocksy/dynamic-data) in all versions up to, and including, 2.1.51 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| creativethemeshq | Blocksy Companion | 0 ~ 2.1.51 | - |
|
II. Public POCs for CVE-2026-18488
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-18488 (1)
Vendor Advisories for CVE-2026-18488 (1)
Proof of Concept for CVE-2026-18488 (1)
Vendor Pages for CVE-2026-18488 (3)
Other References for CVE-2026-18488 (3)
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V. Comments for CVE-2026-18488
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