gallerycreator SimpLy Gallery Plugin up to 3.3.3.1 on WordPress Block Attributes pgc_sgb_render_callback sliderMaxHeight cross site scripting

Summaryinfo

A vulnerability classified as problematic was found in gallerycreator SimpLy Gallery Plugin up to 3.3.3.1. Impacted is the function pgc_sgb_render_callback of the component Block Attributes. Executing a manipulation of the argument sliderMaxHeight can lead to cross site scripting. The identification of this vulnerability is CVE-2026-5743. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in gallerycreator SimpLy Gallery Plugin up to 3.3.3.1 and classified as problematic. This vulnerability affects the function pgc_sgb_render_callback of the component Block Attributes. The manipulation of the argument sliderMaxHeight with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

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.

The advisory is available at wordfence.com. This vulnerability was named CVE-2026-5743 since 04/07/2026. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 3.3.3.2 eliminates this vulnerability.

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Productinfo

Type

• WordPress Plugin

Vendor

• gallerycreator

Name

• SimpLy Gallery Plugin

Version

• 3.3.3.0
• 3.3.3.1

CPE 2.3info

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• 🔒

CPE 2.2info

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• 🔒

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