CVE-2025-69367 in Oyster Plugin
Summary
by MITRE • 02/20/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in GT3themes Oyster - Photography WordPress Theme oyster allows DOM-Based XSS.This issue affects Oyster - Photography WordPress Theme: from n/a through <= 4.4.3.
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Analysis
by VulDB Data Team • 05/25/2026
The vulnerability described represents a critical cross-site scripting flaw classified as DOM-based XSS within the GT3themes Oyster Photography WordPress Theme. This type of vulnerability falls under the Common Weakness Enumeration category CWE-79 which specifically addresses improper neutralization of input during web page generation. The issue manifests when the theme fails to properly sanitize user-supplied input before incorporating it into dynamically generated web content, creating an attack vector that can be exploited by malicious actors to inject malicious scripts into web pages viewed by other users.
The technical exploitation of this vulnerability occurs through manipulation of the Document Object Model where attacker-controlled input is directly processed by JavaScript functions without adequate sanitization or encoding. The affected version range indicates that all versions from the initial release through 4.4.3 contain this flaw, suggesting it has been present for an extended period and likely affects numerous WordPress installations. The DOM-based nature of this XSS vulnerability means that the malicious script is executed within the victim's browser context rather than being stored on the server, making it particularly insidious as it can bypass traditional server-side input validation mechanisms.
The operational impact of this vulnerability extends beyond simple script execution as it can enable attackers to perform a wide range of malicious activities including session hijacking, credential theft, redirection to malicious sites, and data exfiltration. When exploited against administrators or authenticated users, this vulnerability can provide attackers with elevated privileges within the WordPress environment, potentially allowing complete compromise of the affected website. The photography theme context adds additional risk as users may be more likely to trust content within a media-focused interface, making social engineering attacks more effective. According to ATT&CK framework, this vulnerability maps to T1059.007 for JavaScript execution and T1531 for credential access through web applications.
Mitigation strategies should prioritize immediate patching of the theme to the latest available version where the XSS vulnerability has been addressed. Organizations should implement comprehensive input validation and output encoding mechanisms throughout their WordPress installations, particularly focusing on user-generated content and URL parameters. The implementation of Content Security Policy headers can provide an additional layer of protection by restricting script execution sources and preventing unauthorized code injection. Regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other themes and plugins. Security monitoring should include detection of suspicious script patterns and anomalous user behavior that might indicate exploitation attempts. The vulnerability highlights the importance of maintaining up-to-date WordPress themes and plugins, as well as implementing proper security controls such as web application firewalls and input sanitization routines to prevent exploitation of similar flaws in the broader WordPress ecosystem.