CVE-2026-111848 in Geo Mashup Plugin
Summary
by MITRE • 10/22/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Dylan Kuhn Geo Mashup geo-mashup allows Reflected XSS.This issue affects Geo Mashup: from n/a through 1.13.22.
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Analysis
by VulDB Data Team • 10/22/2026
The identified security flaw represents a classic instance of Improper Neutralization of Input During Web Page Generation, commonly known as Cross-Site Scripting or XSS. Specifically, this vulnerability manifests as a Reflected XSS within the Geo Mashup plugin for WordPress, developed by Dylan Kuhn. The affected versions span from no specific lower bound through version 1.13.22, indicating that any installation of this plugin prior to the patched release is susceptible to exploitation. This type of vulnerability occurs when an application receives untrusted data and includes it in a web page without proper validation or escaping, allowing malicious scripts to execute in the context of the victim's browser session.
From a technical perspective, the root cause lies in insufficient sanitization of user-supplied input before it is rendered back into the HTML response. In the case of Geo Mashup, which handles geographic data and map rendering for WordPress sites, certain parameters likely passed via HTTP requests are reflected directly into the page output without adequate encoding. When a victim interacts with a specially crafted URL containing malicious JavaScript payloads, the browser interprets these scripts as part of the legitimate web content. This bypasses same-origin policy protections because the code executes within the domain context of the vulnerable WordPress site, granting it access to cookies, session tokens, and other sensitive information stored by that origin.
The operational impact of this vulnerability is significant for both end-users and website administrators. Attackers can leverage reflected XSS to steal administrative credentials if an administrator visits a malicious link crafted with the exploit payload. This could lead to full compromise of the WordPress installation, allowing unauthorized content modification, defacement, or further propagation of malware through the site's legitimate channels. Additionally, attackers may redirect users to phishing sites designed to harvest login information from unsuspecting visitors. The ability to execute arbitrary JavaScript also enables keylogging, session hijacking, and manipulation of page elements to deceive users into performing unintended actions such as clicking malicious links or submitting sensitive data to external servers controlled by the attacker.
This vulnerability aligns with CWE-79, which categorizes Improper Neutralization of Input During Web Page Generation as a critical weakness in web application security frameworks. It is also mapped to MITRE ATT&CK technique T1059, specifically subtechnique 007 for JavaScript execution under Command and Scripting Interpreter. The reflected nature of the attack places it within the initial access or credential harvesting phases of an intrusion kill chain, where social engineering tactics are often employed alongside technical exploitation to trick users into triggering the payload.
Mitigation strategies must focus on immediate remediation through software updates and long-term defensive coding practices. Administrators running Geo Mashup should immediately upgrade to version 1.13.23 or later, which addresses this input validation deficiency by implementing proper output encoding for all user-controlled data rendered in HTML contexts. Developers should adhere to the principle of least privilege when handling web inputs and consistently apply context-aware escaping techniques such as HTML entity encoding for reflected content. Implementing a Content Security Policy header can also provide an additional layer of defense by restricting the sources from which scripts are allowed to execute, thereby mitigating the impact even if some XSS vectors remain unpatched in legacy systems or third-party integrations.