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CVE-2026-13253— Post Grid Gutenberg Blocks for News, Magazines, Blog Websites <= 5.0.31 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'moreResultsText' Block Attribute

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 Ultimate Post是WordPress基金会的一款CMS组件。 WordPress Ultimate Post 5.0.31及之前版本存在跨站脚本漏洞，该漏洞源于Advanced_Search::content()渲染回调函数中对moreResultsText块属性输入清理和输出转义不足，经由wp_kses()过滤后未转义HTML特殊字符，导致直接拼接至data-viewmoretext属性，容易受到存储型跨站脚本攻击，使得认证攻击者（贡献者级别及以上）在页面中注入Web脚本并

CVSS 6.4 · Medium EPSS 0.36% · P27

Possible ATT&CK Techniques 1 AI

T1059.001 · PowerShell

Affected Version Matrix 1

VendorProduct Version RangeStatus
wpxpo Post Grid Gutenberg Blocks – PostX ≤ 5.0.31 affected
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I. Basic Information for CVE-2026-13253

Vulnerability Information
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Vulnerability Title
Post Grid Gutenberg Blocks for News, Magazines, Blog Websites <= 5.0.31 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'moreResultsText' Block Attribute
Source: CVE Program / CVE List V5
Vulnerability Description
The Ultimate Post plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'moreResultsText' block attribute of the ultimate-post/advanced-search block in versions up to and including 5.0.31. This is due to insufficient input sanitization and output escaping in the Advanced_Search::content() render callback: the attribute value is filtered with wp_kses(), which strips disallowed HTML tags but does NOT escape HTML special characters such as double quotes in plain text, and the result is then concatenated directly into the data-viewmoretext HTML attribute without esc_attr(). 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 Ultimate Post 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Ultimate Post是WordPress基金会的一款CMS组件。 WordPress Ultimate Post 5.0.31及之前版本存在跨站脚本漏洞，该漏洞源于Advanced_Search::content()渲染回调函数中对moreResultsText块属性输入清理和输出转义不足，经由wp_kses()过滤后未转义HTML特殊字符，导致直接拼接至data-viewmoretext属性，容易受到存储型跨站脚本攻击，使得认证攻击者（贡献者级别及以上）在页面中注入Web脚本并
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 ~ 5.0.31 -

II. Public POCs for CVE-2026-13253

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III. Intelligence Information for CVE-2026-13253

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Patches & Fixes for CVE-2026-13253 (3)

Vendor Advisories for CVE-2026-13253 (1)

Other References for CVE-2026-13253 (2)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-13253

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