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CVE-2026-5158— PostX <= 5.0.13 - Authenticated (Contributor+) Stored Cross-Site Scripting via Post Comments Block

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 PostX是WordPress基金会开源的一款网站内容管理系统的扩展组件。 WordPress PostX 5.0.13及之前版本存在跨站脚本漏洞，该漏洞源于输入清理和输出转义不足，可能导致具有贡献者级别及以上权限的认证攻击者通过inputPlaceHolder参数注入任意Web脚本。

CVSS 6.4 · Medium EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript

Affected Version Matrix 1

VendorProduct Version RangeStatus
wpxpo Post Grid Gutenberg Blocks – PostX ≤ 5.0.13 affected
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I. Basic Information for CVE-2026-5158

Vulnerability Information
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Vulnerability Title
PostX <= 5.0.13 - Authenticated (Contributor+) Stored Cross-Site Scripting via Post Comments Block
Source: CVE Program / CVE List V5
Vulnerability Description
The Post Grid Gutenberg Blocks for News, Magazines, Blog Websites – PostX plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'inputPlaceHolder' parameter in all versions up to, and including, 5.0.13 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-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
Vulnerability Title
WordPress PostX 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress PostX是WordPress基金会开源的一款网站内容管理系统的扩展组件。 WordPress PostX 5.0.13及之前版本存在跨站脚本漏洞，该漏洞源于输入清理和输出转义不足，可能导致具有贡献者级别及以上权限的认证攻击者通过inputPlaceHolder参数注入任意Web脚本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
wpxpo Post Grid Gutenberg Blocks – PostX 0 ~ 5.0.13 -

II. Public POCs for CVE-2026-5158

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III. Intelligence Information for CVE-2026-5158

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Other References for CVE-2026-5158 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-5158

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