CVE-2025-15703 in HireZoot Plugin
Summary
by MITRE • 10/12/2026
The HireZoot WordPress plugin before 4.0.0 does not sanitise and escape one of its job specification settings before it is reflected back into an admin-area settings page, allowing users with the HireZoot WordPress plugin before 4.0.0's management capability (Administrator by default) to store a payload that is executed in the browser of any administrator who later opens that page. As the unfiltered_html capability is not available to administrators on multisite (or where DISALLOW_UNFILTERED_HTML is set), this leads to Stored Cross-Site Scripting.
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Analysis
by VulDB Data Team • 10/12/2026
The vulnerability identified within HireZoot WordPress plugin versions prior to 4.0.0 represents a critical security flaw rooted in the improper handling of user-supplied input during administrative configuration processes. Specifically, the defect lies in the job specification settings module where data is accepted from an administrator but fails to undergo adequate sanitization or escaping before being persisted and subsequently rendered back into the admin interface. This architectural oversight allows for the injection of malicious scripts that are stored on the server-side database rather than merely existing transiently in a request parameter, thereby classifying this as a Stored Cross-Site Scripting vulnerability. The persistence of this payload means that every time an authorized user accesses the affected settings page, the browser executes the injected code automatically without requiring further interaction from the victim beyond viewing the page.
From a technical perspective, the core issue is a failure to implement proper output encoding when rendering data retrieved from the database back into HTML context within the WordPress admin area. While input validation might have been partially implemented or assumed sufficient by the developers, the critical step of escaping special characters before reflection was omitted. This allows an attacker with administrative privileges to craft a job specification entry containing JavaScript code instead of legitimate text. Because this data is stored in the database and later served as part of the HTML response for the settings page, it bypasses client-side restrictions that might otherwise limit script execution. The vulnerability exploits the trust relationship between the WordPress admin interface and its users, leveraging the high privilege level inherent to administrator accounts to execute arbitrary code within their own browser sessions.
The operational impact of this vulnerability is severe due to the specific constraints imposed by WordPress multisite environments or configurations where the unfiltered_html capability has been explicitly disabled for administrators via the DISALLOW_UNFILTERED_HTML constant. In standard single-site installations, administrators typically possess broad capabilities that might inadvertently allow certain HTML tags through filters, potentially masking the severity of a stored XSS flaw if it relies on those specific permissions. However, in multisite setups or hardened environments where unfiltered_html is restricted, the ability to inject raw script payloads becomes more distinct and dangerous because standard filtering mechanisms are less permissive. Consequently, an attacker who compromises one administrator account can use this vulnerability to harvest session cookies, hijack administrative sessions, perform actions on behalf of other administrators, or redirect users to malicious phishing sites. This effectively turns a single compromised admin credential into a vector for widespread compromise across the entire WordPress installation.
This flaw aligns with Common Weakness Enumeration (CWE) category CWE-79, which describes Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. More specifically, it falls under Stored XSS where the malicious payload is saved on target servers and retrieved later when users access specific pages. In terms of the MITRE ATT&CK framework for enterprise security, this vulnerability facilitates techniques associated with Collection via Browser Hijacking or Credential Access through Session Cookie Theft. The attack chain typically involves an initial compromise leading to administrative privilege escalation, followed by exploitation of this stored XSS flaw to exfiltrate sensitive data such as authentication cookies and tokens, thereby allowing the attacker to maintain persistent access without needing further password cracking efforts.
Mitigation strategies for organizations utilizing HireZoot or similar WordPress plugins must prioritize immediate updates to version 4.0.0 or later where these input validation and output escaping mechanisms have been corrected by the developers. For environments that cannot immediately patch, administrators should enforce strict Content Security Policy headers if possible, although this is often difficult in dynamic admin areas due to inline script requirements inherent to many WordPress plugins. Additionally, implementing Web Application Firewalls with rules specifically targeting stored XSS patterns in post data and database-driven content can provide a layer of defense-in-depth. Regular security audits focusing on input sanitization and output encoding practices are essential to prevent similar vulnerabilities from being introduced into other parts of the application logic that handle user-modifiable settings.