CVE-2018-25132 Overview
CVE-2018-25132 is a Cross-Site Scripting (XSS) vulnerability affecting MyBB Trending Widget Plugin version 1.2. This vulnerability allows attackers to inject malicious scripts through thread titles. When other users view the trending widget, the injected script payloads execute in their browser context, potentially enabling session hijacking, credential theft, or further malicious actions.
Critical Impact
Attackers can inject malicious JavaScript through thread titles that execute when victims view the trending widget, potentially compromising user sessions and enabling account takeover.
Affected Products
- MyBB Trending Widget Plugin 1.2
- MyBB forums utilizing the vulnerable Trends Widget plugin
- Web applications integrating the affected plugin component
Discovery Timeline
- 2026-01-23 - CVE CVE-2018-25132 published to NVD
- 2026-01-26 - Last updated in NVD database
Technical Details for CVE-2018-25132
Vulnerability Analysis
This stored XSS vulnerability (CWE-79) exists in the MyBB Trending Widget Plugin due to insufficient sanitization of user-supplied input in thread titles. The plugin displays trending threads without properly encoding or escaping HTML entities, allowing script content embedded within thread titles to be rendered and executed by the victim's browser.
The attack requires the attacker to have permissions to create or modify thread titles on the forum. Once malicious content is injected into a thread title, any user viewing the trending widget will have the script execute in their browser session. This can lead to session token theft, keylogging, defacement, or redirection to malicious sites.
Root Cause
The root cause is improper input validation and output encoding in the plugin's rendering logic. When thread titles are fetched and displayed in the trending widget, the plugin fails to apply proper HTML entity encoding or content security policies. User-controlled data flows directly into the HTML output without sanitization, creating the XSS injection point.
Attack Vector
The attack is network-based and requires low privileges (the ability to create or edit thread titles). User interaction is required as victims must view the trending widget for the payload to execute. An attacker would craft a thread title containing JavaScript code such as <script> tags or event handlers. When the trending widget renders this title without sanitization, the browser interprets and executes the embedded script.
The vulnerability mechanism involves malicious JavaScript being stored in the database as part of a thread title, then retrieved and rendered unsanitized in the trending widget HTML output. Technical details and a proof-of-concept are available in the Exploit-DB #49504 entry.
Detection Methods for CVE-2018-25132
Indicators of Compromise
- Thread titles containing <script> tags, javascript: URIs, or HTML event handlers (e.g., onerror, onload, onclick)
- Unexpected JavaScript execution or browser console errors when viewing the trending widget
- User reports of suspicious redirects or behavior when browsing the forum
Detection Strategies
- Implement Web Application Firewall (WAF) rules to detect XSS patterns in HTTP requests targeting thread creation/modification endpoints
- Monitor application logs for thread titles containing HTML tags or JavaScript keywords
- Deploy browser-based XSS detection through Content Security Policy (CSP) violation reporting
- Use SentinelOne Singularity to detect anomalous script execution patterns in web application contexts
Monitoring Recommendations
- Enable verbose logging for thread creation and modification actions
- Set up alerts for CSP violations that may indicate XSS attempts
- Monitor for unusual outbound connections from user browsers that could indicate data exfiltration
- Review trending widget output periodically for suspicious content
How to Mitigate CVE-2018-25132
Immediate Actions Required
- Disable or remove the MyBB Trending Widget Plugin version 1.2 until a patched version is available
- Audit existing thread titles for any injected script content and sanitize affected entries
- Implement server-side input validation to strip or encode HTML entities from thread titles
- Deploy Content Security Policy headers to restrict inline script execution
Patch Information
Check the GitHub Trends Widget Repository for updated versions that address this vulnerability. Review the VulnCheck MyBB Advisory for additional remediation guidance and patch availability information.
Workarounds
- Disable the trending widget feature entirely until the vulnerability is patched
- Implement output encoding at the template level using htmlspecialchars() or equivalent functions
- Restrict thread creation/modification permissions to trusted users only
- Add a WAF rule to block requests containing XSS patterns in thread title parameters
# Example Apache mod_security rule to block XSS in requests
SecRule ARGS "@detectXSS" "id:1,phase:2,deny,status:403,msg:'XSS Attack Detected'"
# PHP output encoding example for plugin modification
# htmlspecialchars($thread_title, ENT_QUOTES, 'UTF-8')
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
