CVE-2026-9134

Photo Gallery by FooGallery : Responsive Image Gallery, Masonry Gallery & Carousel <= 3.1.31 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'custom_attribute_key' Shortcode Parameter

2026-06-12 18:03
Dmitrii Ignatyev

Strategic Overview

Status
Patched in 3.1.32
Affected Plugin
Photo Gallery by FooGallery : Responsive Image Gallery, Masonry Gallery & Carousel
Affected Version
<= 3.1.31
CVSS
6.4Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2026-9134
View all Photo Gallery by FooGallery : Responsive Image Gallery, Masonry Gallery & Carousel vulnerabilities

At a glance

CVE-2026-9134 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Photo Gallery by FooGallery WordPress plugin, affecting versions <= 3.1.31. It carries a CVSS score of 6.4 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Contributor level or above. The issue is fixed in version 3.1.32; sites on affected versions should update now. Disclosed June 2026, reported by Dmitrii Ignatyev.

Vulnerability Overview

The FooGallery plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'custom_attribute_key' shortcode parameter in versions up to, and including, 3.1.31 This is due to an incomplete JavaScript event handler blacklist in the foogallery_sanitize_javascript() function, which blocks only a subset of HTML event attributes (onmouseover, onmouseout, onpointerenter, onclick, onload, onchange, onerror) while permitting others such as 'onmouseenter', combined with the failure to escape the attribute key when building the gallery container HTML in foogallery_build_container_attributes_safe(). 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.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Photo Gallery by FooGallery <= 3.1.31 carries this weakness at custom_attribute_key, and reaching it takes an account at Contributor level or above. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Photo Gallery by FooGallery the fix is 3.1.32: builds <= 3.1.31 are affected, anything from 3.1.32 onward is not.

Remediation

Update to version 3.1.32, or a newer patched version

How does WordSec protect against this?

An attacker needs Contributor access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Photo Gallery by FooGallery 3.1.32 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-9134https://www.wordfence.com/threat-intel/vulnerabilities/id/dd9650e6-7c3c-4510-9749-a3503924855fhttps://nvd.nist.gov/vuln/detail/CVE-2026-9134

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C