CVE-2025-31379 in Insert HTML Here Plugin
Summary
by MITRE • 04/11/2025
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in programphases Insert HTML Here allows Reflected XSS. This issue affects Insert HTML Here: from n/a through 1.0.
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Analysis
by VulDB Data Team • 04/11/2025
The vulnerability identified as CVE-2025-31379 represents a critical cross-site scripting flaw within the Insert HTML Here plugin for programphases. This weakness falls under the CWE-79 category of Cross-Site Scripting, specifically manifesting as a reflected XSS vulnerability that occurs during web page generation processes. The vulnerability stems from inadequate input sanitization mechanisms that fail to properly neutralize malicious script content before incorporating it into dynamically generated web pages. Attackers can exploit this flaw by crafting malicious payloads that get reflected back to users through the vulnerable plugin's handling of user-supplied input data.
The technical implementation of this vulnerability allows threat actors to inject malicious JavaScript code into web pages through improperly validated input parameters. When users interact with the affected plugin, their browsers execute the injected scripts, potentially leading to session hijacking, credential theft, or redirection to malicious sites. The reflected nature of this XSS means that the malicious payload must be crafted to be included in a request that gets immediately reflected back to the user, making the attack vector particularly insidious as it requires no persistent storage of malicious code within the application itself. The vulnerability affects all versions from the initial release through version 1.0, indicating a fundamental flaw in the input processing logic that was not properly addressed in the development lifecycle.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with the capability to manipulate user sessions and potentially escalate privileges within the affected application environment. This type of vulnerability can be leveraged to perform session riding attacks, steal authentication tokens, or redirect users to phishing sites designed to capture sensitive information. The reflected XSS characteristic means that the attack can be delivered through social engineering techniques, where users are tricked into clicking malicious links that contain the exploit payload. Organizations using this plugin face significant risk of data breaches and unauthorized access to their web applications, particularly in environments where user interaction is frequent and input validation is insufficient.
Mitigation strategies for CVE-2025-31379 should prioritize immediate plugin updates to versions that address the input sanitization flaws, while implementing comprehensive input validation measures across all user-facing interfaces. Organizations must deploy proper content security policies and implement proper output encoding mechanisms to prevent script execution in web contexts. The remediation approach should include validating and sanitizing all user-supplied input before processing, implementing proper escape sequences for HTML content, and establishing robust monitoring systems to detect potential exploitation attempts. Security teams should also consider implementing web application firewalls and regular security assessments to identify similar vulnerabilities within their application ecosystems. This vulnerability aligns with ATT&CK technique T1566.001 for phishing with malicious attachments and T1071.001 for application layer protocol usage, highlighting the need for comprehensive network security measures to prevent exploitation.