CVE-2026-1643 identifies a reflected cross-site scripting (XSS) vulnerability in the MP-Ukagaka plugin for WordPress, affecting all versions up to and including 1.5.2. The root cause is improper neutralization of input during web page generation, specifically insufficient input sanitization and output escaping, which allows attackers to inject arbitrary JavaScript code into web pages. This vulnerability is classified under CWE-79. An unauthenticated attacker can exploit this flaw by crafting a malicious URL containing the injected script and convincing a user to click it. Upon clicking, the malicious script executes in the context of the victim’s browser, potentially leading to theft of session cookies, user credentials, or performing actions on behalf of the user. The CVSS v3.1 base score is 6.1, reflecting a medium severity with the vector AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N, indicating network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, and partial impact on confidentiality and integrity but no impact on availability. No known exploits have been reported in the wild at the time of publication. The vulnerability affects all versions of the MP-Ukagaka plugin, which is used to extend WordPress functionality, often in niche or community-driven sites. The lack of patches currently necessitates alternative mitigations. The vulnerability’s exploitation scope is limited by the need for user interaction but remains significant due to the widespread use of WordPress and the potential for targeted phishing campaigns.

For European organizations, this vulnerability poses a risk primarily to the confidentiality and integrity of user data on affected WordPress sites. Attackers could hijack user sessions, steal sensitive information, or perform unauthorized actions within the context of the victim’s privileges. Public-facing websites using the MP-Ukagaka plugin are particularly vulnerable, potentially impacting customer trust and regulatory compliance under GDPR if personal data is compromised. The reflected XSS nature means attacks require social engineering, but successful exploitation can lead to credential theft or unauthorized transactions. While availability is not directly affected, the reputational damage and potential legal consequences of data breaches are significant. Organizations relying on this plugin for customer engagement or internal portals should consider the risk of targeted attacks, especially in sectors like e-commerce, finance, and public services where data sensitivity is high. The absence of known exploits reduces immediate risk but does not eliminate the threat, as attackers may develop exploits rapidly once details are public.

1. Monitor for official patches or updates from the ariagle project and apply them promptly once available. 2. In the absence of patches, implement Web Application Firewalls (WAFs) with robust XSS detection and blocking rules tailored to the MP-Ukagaka plugin’s request patterns. 3. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts on affected web pages. 4. Sanitize and validate all user inputs at the application level, especially URL parameters that the plugin processes. 5. Educate users and staff about the risks of clicking on unsolicited or suspicious links to reduce successful social engineering attempts. 6. Conduct regular security assessments and penetration testing focusing on XSS vulnerabilities in WordPress environments. 7. Consider temporarily disabling or replacing the MP-Ukagaka plugin with alternative solutions until a secure version is available. 8. Monitor logs for unusual URL requests or error messages indicative of attempted exploitation. 9. Use multi-factor authentication to reduce the impact of stolen credentials resulting from XSS attacks. 10. Ensure that session cookies are set with HttpOnly and Secure flags to mitigate cookie theft via XSS.