The Login/Signup Popup (Inline Form + Woocommerce) plugin for WordPress is vulnerable to Stored Cross-Site Scripting (XSS) via the plugin's xoo_el_action shortcode. This vulnerability affects all versions up to and including 2.8.5 due to insufficient input sanitization and output escaping on user supplied attributes. As a result, authenticated attackers with contributor-level access and above can inject arbitrary web scripts into pages which execute whenever a user accesses the affected page.
This vulnerability has a CVSS score of 6.4, indicating a medium severity level. It is critical for organizations using this plugin to understand the potential risks associated with this vulnerability as it allows for unauthorized script execution, which can lead to data theft or further compromise of user accounts.
Organizations should prioritize patching immediately. The vulnerability was published on February 20, 2025, and effective remediation measures are necessary to mitigate the associated risks.
The nature of the vulnerability, combined with the potential impacts, underscores the importance of maintaining up-to-date software and vigilant security practices.
Vulnerability Details
The vulnerability allows for Stored Cross-Site Scripting due to inadequate input sanitization within the plugin. CVSS version 3.1 rates this vulnerability with an attack vector of NETWORK, low attack complexity, and low privileges required, indicating that it can be exploited with little effort by an authenticated user.
Affected products include the Login/Signup Popup plugin, and the vendor is identified as Xootix. The weakness is classified under CWE-79. The vulnerability is impactful enough to warrant immediate attention.
Technical Analysis
The root cause of this vulnerability lies in the failure to properly sanitize user input and escape output. Attackers can exploit this flaw by injecting malicious scripts which are then executed in the context of the victim's browser when they access the affected page.
The attack vector is network-based, and it requires low complexity to execute. Attackers need to have authenticated access but can do so with minimal privileges. User interaction is not required for the attack to succeed.
The impact on confidentiality and integrity is low, while availability is not affected. This indicates that while sensitive data may not be directly compromised, the potential for unauthorized actions remains.
Risk & Impact Analysis
Risk to organizations includes the potential for data theft and unauthorized actions performed on behalf of legitimate users. The blast radius can extend to all users interacting with the affected plugin, making it a critical vulnerability to address.
Given the CVSS score of 6.4, this vulnerability should be addressed in the priority patch cycle. Organizations must remain vigilant and proactive in their patch management processes to protect against such vulnerabilities.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerable versions of the Login/Signup Popup plugin are all versions up to and including 2.8.5. Organizations are advised to upgrade to version 2.8.6 or later to mitigate this vulnerability.
Mitigation & Remediation
Organizations should implement the following mitigation strategies:
1. Upgrade to Login/Signup Popup plugin version 2.8.6 or later.
2. If an immediate upgrade is not possible, consider disabling the plugin until a patch is applied to prevent potential exploitation.
3. Conduct a review of user input sanitization practices and ensure that similar vulnerabilities are not present in other plugins.
For further assistance with security assessments, organizations can explore our application security assessment services.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor for the following indicators:
1. Unusual behavior in user sessions that may indicate unauthorized script execution.
2. Logs for any unexpected input in user-supplied fields that are processed by the plugin.
3. Network traffic patterns that suggest unauthorized access attempts or script injections.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability highlights a common oversight in plugin development regarding input sanitization. Security teams should recognize this as a recurring theme in application security, especially in user-input scenarios.
Organizations must implement regular security assessments to identify and rectify vulnerabilities before they can be exploited. For comprehensive assessment strategies, organizations can refer to our penetration testing services.
This case also serves as a reminder for maintaining up-to-date software and the importance of community vigilance in reporting vulnerabilities. Security teams should also focus on user education to mitigate risks associated with social engineering attacks.
Finally, organizations can gain further insights from our penetration testing methodology guide to enhance their security posture.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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