CVE-2026-114710 in Gallery PhotoBlocks Plugin
Summary
by MITRE • 10/26/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in WP Chill Gallery PhotoBlocks photoblocks-grid-gallery allows Stored XSS.This issue affects Gallery PhotoBlocks: from n/a through 1.3.7.
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Analysis
by VulDB Data Team • 10/26/2026
The identified vulnerability represents a classic instance of Improper Neutralization of Input During Web Page Generation, commonly known as Cross-Site Scripting or XSS. Specifically, this flaw manifests as a Stored XSS within the WP Chill Gallery PhotoBlocks plugin for WordPress, affecting versions ranging from n/a through 1.3.7. Unlike reflected XSS where malicious scripts are executed via manipulated URLs, stored vulnerabilities persist on the target server because user-supplied input is saved in a database or other persistent storage mechanism without adequate sanitization. In this context, an attacker can inject malicious JavaScript code into gallery metadata, captions, titles, or configuration settings within the PhotoBlocks grid gallery component. Once injected, this script remains active and is served to every visitor who views the affected gallery page, turning any user with access to view public content into a potential victim of exploitation.
From a technical perspective, the root cause lies in the failure of the application to properly validate or encode special characters such as angle brackets, quotes, and ampersands before rendering them within HTML context. When the WordPress environment processes these inputs for display, it treats the injected script tags as executable code rather than static text data. This lack of output encoding allows the browser's JavaScript engine to parse and execute the malicious payload in the security context of the website domain. Because the vulnerability is stored, the impact extends beyond a single interaction; every subsequent page load that renders the compromised gallery content triggers the execution of the attacker-controlled script. This persistence makes it particularly dangerous as it does not require social engineering tricks like phishing links to trigger repeatedly, although such tactics can amplify its reach by directing more victims to the infected pages.
The operational impact of this vulnerability is severe and multifaceted. The primary consequence is the compromise of user sessions through session hijacking. By executing scripts in the context of the vulnerable site, an attacker can steal authentication cookies, tokens, or other sensitive credentials stored in browser storage. This allows the adversary to impersonate legitimate users, including administrators if they view the compromised content, thereby gaining unauthorized access to the WordPress dashboard and backend systems. Beyond session theft, this vulnerability facilitates data exfiltration where sensitive information displayed on the page is read by the malicious script and sent to an external server controlled by the attacker. Furthermore, it enables defacement of the website appearance or redirection of users to phishing sites designed to harvest further credentials. The ability to execute arbitrary JavaScript also opens doors for keylogging attacks within the browser session, potentially capturing sensitive keystrokes entered while viewing the gallery.
In terms of industry standard classifications, this vulnerability aligns with CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'). More specifically, because the malicious payload is stored in a database and executed later upon retrieval, it falls under CWE-836: Use of Password Hash Instead of Credentials for Access Control if used to bypass authentication, or more accurately CWE-79 which covers the general category. In the context of the MITRE ATT&CK framework, this vulnerability supports several tactics including Initial Access via Spearphishing Attachment or Link if combined with social engineering, and Execution through Browser Scripting. It also facilitates Credential Access by stealing session cookies and Data Exfiltration over an existing C2 channel established after script execution. The persistence aspect means it can be categorized under Persistence mechanisms where the attacker maintains a foothold on the web application infrastructure.
Mitigation strategies must address both immediate remediation and long-term security hygiene. The most effective solution is to upgrade the WP Chill Gallery PhotoBlocks plugin to version 1.3.8 or later, where the developers have presumably implemented proper input validation and output encoding techniques such as HTML entity encoding for user-supplied data before it is rendered in the browser. For organizations unable to patch immediately due to compatibility constraints, a temporary mitigation involves implementing Web Application Firewall rules that detect and block common XSS payloads containing script tags, event handlers like onerror or onload, and javascript: URIs within gallery input fields. Additionally, enforcing Content Security Policy headers can significantly reduce the impact by restricting the sources from which scripts are allowed to execute, thereby preventing inline malicious scripts from running even if they are successfully injected into the DOM. Regular security audits and code reviews focusing on data flow between user inputs and HTML output contexts are essential to prevent similar vulnerabilities in future development cycles.