CVE-2025-27002 is a reflected Cross-site Scripting (XSS) vulnerability identified in the LambertGroup CountDown With Image or Video Background plugin, versions up to and including 1.5. The vulnerability stems from improper neutralization of input during web page generation, which allows an attacker to inject malicious scripts into web pages dynamically generated by the plugin. Specifically, the plugin fails to adequately sanitize user-supplied input before embedding it into the HTML output, enabling attackers to craft URLs or inputs that, when visited or processed by a victim's browser, execute arbitrary JavaScript code. This type of reflected XSS requires the victim to interact with a maliciously crafted link or input, making social engineering a likely exploitation vector. The CVSS 3.1 base score is 6.1, indicating medium severity, with the vector string AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. This means the attack is network exploitable, requires low attack complexity, no privileges, but does require user interaction. The scope is changed, indicating that the vulnerability affects resources beyond the initially vulnerable component, and the impact is limited to confidentiality and integrity, with no availability impact. No known public exploits or patches are currently available, but the vulnerability is published and should be addressed promptly. The plugin is typically used to add countdown timers with image or video backgrounds on websites, often public-facing, which increases exposure. The vulnerability could be exploited to steal session cookies, perform actions on behalf of users, or deface web content, undermining user trust and potentially leading to further attacks.

For European organizations, the reflected XSS vulnerability in the LambertGroup CountDown plugin poses a moderate risk primarily to confidentiality and integrity of web applications. Attackers could exploit this flaw to hijack user sessions, steal sensitive information such as authentication tokens, or manipulate website content to mislead users or distribute malware. Public-facing websites using this plugin are particularly vulnerable, potentially affecting customer trust and brand reputation. While the vulnerability does not impact availability, the indirect consequences of successful exploitation—such as phishing or malware distribution—could lead to operational disruptions. Organizations in sectors with high web traffic or those relying on customer-facing countdown timers (e.g., e-commerce, event management, marketing) are at higher risk. The lack of known exploits in the wild currently reduces immediate threat levels but does not eliminate the risk, especially as attackers often develop exploits after vulnerability disclosure. Failure to remediate could also lead to regulatory compliance issues under GDPR if user data is compromised.

1. Monitor for and apply official patches or updates from LambertGroup as soon as they become available to address CVE-2025-27002. 2. Implement strict input validation and output encoding on all user-supplied data to prevent injection of malicious scripts, using context-aware encoding methods. 3. Deploy Content Security Policy (CSP) headers to restrict the execution of inline scripts and limit sources of executable code, mitigating the impact of reflected XSS. 4. Employ web application firewalls (WAFs) with rules designed to detect and block reflected XSS attack patterns targeting this plugin. 5. Educate users and administrators about the risks of clicking untrusted links, as exploitation requires user interaction. 6. Conduct regular security assessments and penetration testing focusing on web application input handling and third-party plugins. 7. Consider replacing or disabling the vulnerable plugin if immediate patching is not feasible, especially on high-risk or critical websites. 8. Review and harden session management mechanisms to reduce the impact of potential session hijacking. 9. Monitor web server and application logs for suspicious requests that may indicate attempted exploitation.