CVE-2026-81155 in Robo Gallery Plugin
Summary
by MITRE • 10/11/2026
The Robo Gallery WordPress plugin before 5.2.6 does not sanitise and escape a gallery setting before outputting it on a frontend page, allowing users with the Author role and above to perform Stored Cross-Site Scripting attacks that execute in the browser of any visitor viewing a gallery, including administrators.
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Analysis
by VulDB Data Team • 10/11/2026
The Robo Gallery WordPress plugin versions prior to 5.2.6 contain a critical input validation failure that results in stored cross-site scripting vulnerabilities within its frontend rendering logic. This security flaw stems from an insufficient sanitization and escaping mechanism applied to specific gallery configuration settings before they are rendered on public-facing web pages. In secure software development, particularly for content management systems like WordPress, any data originating from user inputs or administrative configurations must be rigorously validated against expected formats and escaped using context-appropriate encoding techniques such as HTML entity encoding when outputting to an HTML document. The absence of these protective measures in the affected plugin versions allows malicious scripts to persist within the application's database and subsequently execute in the browsers of users who view the compromised gallery content.
The operational impact of this vulnerability is significant due to its stored nature, which distinguishes it from reflected cross-site scripting attacks where payload delivery requires active user interaction with a crafted link. In this scenario, an attacker with Author role privileges or higher can inject malicious JavaScript code into the gallery settings during normal administrative operations. Once saved, this payload becomes part of the static content served to all visitors who access pages containing that specific gallery. This means that every visitor viewing the page will execute the injected script in their browser context without any additional interaction required by the attacker beyond the initial setup. The persistence of the code ensures a prolonged window of opportunity for exploitation until the vulnerable plugin is updated or the malicious setting is manually removed from the database.
From an industry standards perspective, this vulnerability aligns with CWE-79, which describes Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. The specific execution context places it under OWASP Top 10 categories related to injection flaws where untrusted data is sent to a web browser without validation or encoding. Furthermore, the exploitation technique maps directly to MITRE ATT&CK tactic TA0005 Defense Evasion and specifically sub-technique T1059 Command Scripting via JavaScript execution in browsers. The ability for an attacker with Author-level access to escalate their impact by affecting administrators highlights a privilege escalation risk inherent in poorly designed input handling mechanisms within WordPress plugins that do not strictly enforce role-based output filtering.
Mitigation strategies must prioritize immediate remediation through software updates and rigorous code auditing practices. Administrators running affected versions of the Robo Gallery plugin should upgrade immediately to version 5.2.6 or later, where these sanitization functions have been properly implemented. For organizations unable to patch instantly due to compatibility constraints, temporary workarounds may include restricting user roles that can modify gallery settings to only those with Administrator privileges and implementing a Web Application Firewall rule set designed to detect and block common cross-site scripting payloads in POST requests targeting the plugin's configuration endpoints. Long-term security posture improvements involve adopting secure coding standards such as OWASP Secure Coding Practices which mandate defense-in-depth approaches including input validation, output encoding, and content security policy headers to mitigate the impact of any future vulnerabilities that may arise from similar architectural oversights.