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CVE-2026-96840— Post Grid Gutenberg Blocks <= 5.1.0 - Unauthenticated Stored Cross-Site Scripting via display_name User Field

Quick assessment

Affected
wpxpo Post Grid Gutenberg Blocks – PostX
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 插件 Post Grid Gutenberg Blocks – PostX 在所有版本（包括 5.1.0 及以下）中存在存储型跨站脚本（Stored XSS）漏洞。该漏洞源于对用户字段 的输入清理和输出转义不充分。攻击者无需认证即可在页面中注入任意恶意 Web 脚本，当其他用户访问被注入脚本的页面时，这些脚本便会自动执行。 WordPress 核心代码中的 过滤器会对 、 和 等字符进行实体编码，但保留了双引号（采用 模式）。这使得具有“订阅者（Subscriber）”权限的用户可以通过访问 页

CVSS 7.2 · High EPSS 0.24% · P13

Affected Version Matrix 1

VendorProduct Version RangeStatus
wpxpo Post Grid Gutenberg Blocks – PostX ≤ 5.1.0 affected
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I. Basic Information for CVE-2026-96840

Vulnerability Information
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Vulnerability Title
Post Grid Gutenberg Blocks <= 5.1.0 - Unauthenticated Stored Cross-Site Scripting via display_name User Field
Source: CVE Program / CVE List V5
Vulnerability Description
The Post Grid Gutenberg Blocks – PostX plugin for WordPress is vulnerable to Stored Cross-Site Scripting via display_name User Field in all versions up to, and including, 5.1.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. WordPress core's pre_user_display_name filter encodes &, <, and > but leaves double-quotes intact (ENT_NOQUOTES), allowing a Subscriber-level user to store a double-quote in their display_name via /wp-admin/profile.php that subsequently breaks out of the alt="" attribute at Archive_Title.php:144.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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
wpxpo Post Grid Gutenberg Blocks – PostX 0 ~ 5.1.0 -

II. Public POCs for CVE-2026-96840

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III. Intelligence Information for CVE-2026-96840

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Patches & Fixes for CVE-2026-96840 (1)

Vendor Advisories for CVE-2026-96840 (1)

Vendor Pages for CVE-2026-96840 (1)

Other References for CVE-2026-96840 (2)

IV. Related Vulnerabilities

Same product: Post Grid Gutenberg Blocks – PostX
Same vendor: wpxpo
Same weakness: CWE-79

V. Comments for CVE-2026-96840

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