The WP Allowed Hosts plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'allowed-hosts' parameter in all versions up to, and including, 1.0.8 due to insufficient input sanitization and output escaping. This vulnerability allows authenticated attackers, with administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
With a CVSS score of 4.4, this vulnerability is classified as medium severity. It holds the potential for significant impact on the confidentiality and integrity of affected systems. Organizations utilizing this plugin should understand the real-world risk context and prioritize remediation efforts.
Currently, there is no known public exploit for this vulnerability, although it is imperative for organizations to adhere to best practices in web security. The urgency for defenders is to address this in their patch cycle to prevent potential exploitation by malicious actors.
Organizations should prioritize patching immediately.
Vulnerability Details
The WP Allowed Hosts plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'allowed-hosts' parameter in all versions up to, and including, 1.0.8 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')).
The vulnerability has a CVSS score of 4.4, indicating a medium severity level. The attack vector is network-based, with high complexity and requires high privileges. No user interaction is needed, and the scope is changed.
Technical Analysis
The root cause of this vulnerability stems from insufficient input sanitization and output escaping in the 'allowed-hosts' parameter. Attackers may leverage this to perform stored cross-site scripting attacks. The attack vector is network-based, meaning the attacker does not need physical access to the server to exploit the vulnerability.
The complexity of the attack is high, as it requires authenticated access with administrator-level privileges. User interaction is not required, allowing attackers to execute arbitrary scripts without end-user engagement.
The vulnerability impacts confidentiality and integrity, with both classified as low, while availability remains unaffected.
Risk & Impact Analysis
Risk to organizations includes the potential for unauthorized access to sensitive information and manipulation of web content. The exploitation of this vulnerability can lead to a loss of trust from users, damage to the organization’s reputation, and potential legal ramifications.
Given the current landscape of web application security, the potential for exploitation is significant, especially for multi-site installations where the impact can be more widespread. Organizations should address this in their priority patch cycle.
The urgency for organizations is to recognize the medium severity of this vulnerability and act accordingly.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions prior to vendor patch.
Mitigation & Remediation
Organizations should update the WP Allowed Hosts plugin to the latest version immediately. If an update is not possible, consider implementing input sanitization measures, restrict administrator access, and monitor logs for unusual activity.
For more thorough testing of web applications, consider utilizing penetration testing to validate security measures.
Detection Guidance
Monitor application logs for any signs of unauthorized access or script injections. Additionally, keep an eye on user interactions that might indicate exploitation attempts.
AppSecure Threat Intelligence Insight
The ongoing monitoring of vulnerabilities like CVE-2026-0734 is essential for identifying potential threats and improving security postures. This vulnerability highlights the importance of proper input sanitization and the necessity for regular updates.
Security teams should review their application security measures and consider adopting practices such as penetration testing methodology to ensure robust defenses against similar vulnerabilities.
For organizations utilizing WordPress, implementing a vulnerability management program can aid in proactively identifying and addressing security flaws.
Engaging in regular security assessments is crucial for maintaining the integrity of web applications and safeguarding user data.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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