CVE-2026-108041 in SEOPress Plugin
Summary
by MITRE • 11/04/2026
The SEOPress WordPress plugin before 10.4 does not sanitise and escape some of its analytics tracking settings before outputting them in an inline script printed on every front-end page, allowing users granted a SEOPress WordPress plugin before 10.4 capability that an administrator can delegate to lower-privileged roles to perform Stored Cross-Site Scripting attacks that execute in the browser of any site visitor, including a logged-in administrator viewing the front end.
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Analysis
by VulDB Data Team • 11/04/2026
The vulnerability identified in SEOPress versions prior to 10.4 represents a critical security flaw rooted in insufficient input validation and output encoding mechanisms within the plugin's analytics configuration module. This issue specifically affects settings related to tracking parameters that are rendered directly into inline JavaScript blocks on every page load of a WordPress site. The core technical failure lies in the absence of proper sanitization when accepting user-supplied data from administrative interfaces, combined with a lack of escaping during the subsequent output phase where these values are embedded within HTML context as executable script content. This dual failure creates an environment where malicious payloads can persist on the server side and be executed client-side without further interaction or additional exploitation steps beyond initial access to the vulnerable configuration area.
From a technical perspective, this vulnerability is classified under CWE-79, which denotes Improper Neutralization of Input During Web Page Generation commonly known as Cross-Site Scripting. More specifically, it falls into the category of Stored XSS because the malicious code is saved within the application's database or configuration files rather than being passed via a single request parameter that disappears after execution. When an attacker with delegated administrative privileges injects crafted JavaScript code through these analytics settings fields, the payload becomes part of the site's persistent state. Consequently, every time any user visits the front end of the website, including high-privilege users such as administrators who may be reviewing site performance or content, their browser parses and executes the injected script within the context of the vulnerable domain.
The operational impact of this vulnerability is severe due to its broad attack surface and potential for privilege escalation. Since the malicious script executes in the browser of any visitor, attackers can steal session cookies, hijack active sessions, perform actions on behalf of authenticated users, or redirect victims to phishing sites designed to capture credentials. The ability to target logged-in administrators viewing the front end is particularly dangerous as it allows an attacker with lower-level delegated capabilities to compromise the highest level of access available within the WordPress ecosystem. This can lead to complete site takeover, defacement, malware distribution, and unauthorized modification of sensitive data stored by the website or its users.
This vulnerability aligns with several techniques in the MITRE ATT&CK framework for enterprise security. It corresponds primarily to T1059 Command and Scripting Interpreter via JavaScript execution within a browser context. Furthermore, because it involves stealing session tokens or cookies from authenticated users, it maps directly to T1539 Steal Web Session Cookie. The persistence aspect of the attack also relates to T1189 Drive-by Compromise if viewed through the lens of automated exploitation against unsuspecting visitors, although in this specific case, the primary vector is targeted at privileged administrators viewing the site.
Mitigation strategies must focus on immediate remediation and long-term secure coding practices. The most effective solution is to upgrade the SEOPress plugin to version 10.4 or later where these input validation and output encoding flaws have been addressed by the developers. For organizations unable to update immediately, temporary mitigations include restricting who has access to the analytics configuration settings within WordPress roles and capabilities, ensuring that only trusted senior administrators can modify these fields. Additionally implementing a Web Application Firewall with rules capable of detecting and blocking common XSS payloads in POST requests targeting plugin options may provide an additional layer of defense. Regular security audits focusing on how user input is handled across all plugins are essential to prevent similar vulnerabilities from being introduced or exploited in the future.