CVE-2025-57887: NooTheme Jobmonster Stored XSS Vulnerability

CVE-2025-57887 Overview

CVE-2025-57887 is a stored cross-site scripting (XSS) vulnerability in the NooTheme Jobmonster WordPress theme. The flaw affects all versions of Jobmonster up to and including 4.8.0. Attackers with low-privileged authenticated access can inject malicious JavaScript payloads that persist in the application and execute in the browsers of other users who view the affected content.

The vulnerability is classified under CWE-79, Improper Neutralization of Input During Web Page Generation. Exploitation requires user interaction and produces a scope change, allowing the injected script to impact resources beyond the vulnerable component.

Critical Impact
Authenticated attackers can inject persistent JavaScript that executes in victim browsers, enabling session theft, credential harvesting, and unauthorized actions performed as the victim user.

Affected Products

NooTheme Jobmonster WordPress theme (all versions through 4.8.0)
WordPress sites deploying noo-jobmonster for job board functionality
Any downstream site or subsite rendering user-supplied content processed by the theme

Discovery Timeline

2025-08-22 - CVE-2025-57887 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-57887

Vulnerability Analysis

The Jobmonster theme fails to properly neutralize user-supplied input before rendering it into web pages generated by the application. An authenticated user with low privileges can submit crafted input containing HTML or JavaScript. The theme stores that input and later returns it to other visitors without adequate output encoding or sanitization.

Because the payload is stored server-side, every subsequent request that renders the affected content triggers script execution. This differs from reflected XSS, which requires a victim to click a specially crafted link. The scope change indicator in the CVSS vector reflects that injected scripts can affect resources under a different security authority, such as an administrative session viewing a lower-privileged submission.

Successful exploitation lets attackers execute arbitrary JavaScript in the victim's browser context. Typical outcomes include session cookie exfiltration, forced actions against the WordPress admin interface, redirection to attacker-controlled infrastructure, and defacement of theme-rendered pages.

Root Cause

The root cause is missing or insufficient input validation and output encoding in Jobmonster components that accept user-supplied data. Fields exposed to job seekers, employers, or other authenticated roles are stored without stripping active content and rendered without HTML entity encoding. This pattern maps directly to CWE-79.

Attack Vector

Exploitation requires an authenticated account with the ability to submit content processed by the theme, such as a candidate or employer role. The attacker submits a job listing, profile field, or comparable input containing an XSS payload. When an administrator or another user views the stored content, the payload executes in their browser and inherits their session context.

For technical specifics, see the Patchstack WordPress XSS Vulnerability advisory.

Detection Methods for CVE-2025-57887

Indicators of Compromise

Job listings, profiles, or theme-managed fields containing <script>, onerror=, onload=, or javascript: payloads
Unexpected outbound requests from administrator browsers to unfamiliar domains shortly after viewing user-submitted content
New or modified WordPress administrator accounts created without corresponding audit log entries
Session cookies for wp-admin observed in web server logs referencing external referrers

Detection Strategies

Scan the WordPress database, especially post metadata and custom Jobmonster tables, for HTML tags and JavaScript event handlers in user-submitted fields
Deploy a web application firewall rule set that flags XSS patterns in POST parameters directed at Jobmonster endpoints
Enable a strict Content Security Policy in report-only mode to surface unauthorized inline script execution

Monitoring Recommendations

Monitor authentication logs for administrator sessions that follow visits to candidate or employer submission pages
Alert on WordPress REST API calls that create users, install plugins, or modify roles outside change windows
Retain and review web server access logs for anomalous requests originating from administrator IP addresses immediately after content review actions

How to Mitigate CVE-2025-57887

Immediate Actions Required

Identify all WordPress sites running the NooTheme Jobmonster theme at version 4.8.0 or earlier
Restrict registration and content submission workflows until a patched version is deployed
Audit existing Jobmonster-managed content for stored payloads and remove any malicious entries
Rotate administrator credentials and invalidate active WordPress sessions if suspicious activity is observed

Patch Information

At the time of publication, the NVD entry lists affected versions as n/a through 4.8.0. Site owners should consult the Patchstack advisory and the NooTheme vendor for the fixed release, and upgrade as soon as a corrected version is available.

Workarounds

Apply virtual patching through a WordPress-aware web application firewall that blocks XSS payloads in Jobmonster form submissions
Enforce a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins
Limit low-privileged roles to only the fields required for their workflow and disable HTML input where possible
Review and sanitize existing stored content before returning submission workflows to normal operation

bash

# Example Content Security Policy header for Nginx to reduce XSS impact
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'" always;