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CVE-2026-5743— Mixed Media Gallery Blocks <= 3.3.3.1 - Authenticated (Author+) Stored Cross-Site Scripting via sliderMaxHeight Block Attribute

Quick assessment

Affected
gallerycreator SimpLy Gallery
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 SimpLy Gallery是WordPress基金会的一款 WordPress 图库插件，支持在区块编辑器中创建响应式图片、视频、音频混合媒体画廊、相册、滑块和灯箱效果。 SimpLy Gallery 3.3.3.2及之前版本存在跨站脚本漏洞，该漏洞源于对sliderMaxHeight块属性输入清理和输出转义不足，且pgc_sgb_sanitize_custom_css()函数使用的正则表达式存在缺陷，未能捕获无引号事件处理程序，容易受到存储型跨站脚本攻击。

CVSS 6.4 · Medium EPSS 0.45% · P37

Affected Version Matrix 1

VendorProduct Version RangeStatus
gallerycreator SimpLy Gallery ≤ 3.3.3.1 affected
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I. Basic Information for CVE-2026-5743

Vulnerability Information
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Vulnerability Title
Mixed Media Gallery Blocks <= 3.3.3.1 - Authenticated (Author+) Stored Cross-Site Scripting via sliderMaxHeight Block Attribute
Source: CVE Program / CVE List V5
Vulnerability Description
The SimpLy Gallery Block & Lightbox plugin for WordPress is vulnerable to Stored Cross-Site Scripting via block attributes in all versions up to, and including, 3.3.3.2. This is due to insufficient input sanitization and output escaping on the sliderMaxHeight block attribute in the pgc_sgb_render_callback() function. The vulnerability exists because the pgc_sgb_sanitize_custom_css() function uses a flawed regex pattern that only removes event handlers with quoted values (e.g., onfocus="alert()") but fails to catch unquoted event handlers (e.g., onfocus=alert(document.cookie)), allowing the malicious code to bypass sanitization. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in pages via block attributes 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 SimpLy Gallery 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress SimpLy Gallery是WordPress基金会的一款 WordPress 图库插件，支持在区块编辑器中创建响应式图片、视频、音频混合媒体画廊、相册、滑块和灯箱效果。 SimpLy Gallery 3.3.3.2及之前版本存在跨站脚本漏洞，该漏洞源于对sliderMaxHeight块属性输入清理和输出转义不足，且pgc_sgb_sanitize_custom_css()函数使用的正则表达式存在缺陷，未能捕获无引号事件处理程序，容易受到存储型跨站脚本攻击。
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
gallerycreator SimpLy Gallery 0 ~ 3.3.3.1 -

II. Public POCs for CVE-2026-5743

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III. Intelligence Information for CVE-2026-5743

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Patches & Fixes for CVE-2026-5743 (6)

News Coverage for CVE-2026-5743 (1)

Other References for CVE-2026-5743 (1)

IV. Related Vulnerabilities

Same product: SimpLy Gallery
Same vendor: gallerycreator
Same weakness: CWE-79

V. Comments for CVE-2026-5743

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