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CVE-2026-5743: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in gallerycreator SimpLy Gallery

0
Medium
VulnerabilityCVE-2026-5743cvecve-2026-5743cwe-79
Published: 07/11/2026 (07/11/2026, 02:31:16 UTC)
Source: CVE Database V5
Vendor/Project: gallerycreator
Product: SimpLy Gallery

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.

CVSS v3.1

Score 6.4medium

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Technical Details

Data Version
5.2
Assigner Short Name
Wordfence
Date Reserved
2026-04-07T13:48:55.983Z
Cvss Version
3.1
State
PUBLISHED
Remediation Level
null

Threat ID: 6a51b98168715ace430ae4e6

Added to database: 07/11/2026, 03:33:21 UTC

Last updated: 07/11/2026, 03:33:21 UTC

Views: 1

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