EUVD-2026-52965
GHSA-qwmv-6gjc-9vr4
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Network-delivered stored XSS, no authentication to inject (PR:N), victim admin interaction required (UI:R), browser context crossed (S:C); no availability impact.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
3DescriptionCVE.org
Cross Site Scripting vulnerability in Soliton Systems MailZen Management Protal v.2.62, v.2.63 allows a remote attacker to execute arbitrary code via the Role Name, First Name, Last Name, and Username fields.
AnalysisAI
Cross-site scripting in Soliton Systems MailZen Management Portal versions 2.62 and 2.63 allows a network-accessible, unauthenticated attacker to inject malicious JavaScript into user-controlled fields (Role Name, First Name, Last Name, Username) that is subsequently rendered to authenticated users - most likely administrators reviewing account data. Exploitation yields client-side arbitrary JavaScript execution in the victim's browser context, enabling session hijacking, credential theft, or unauthorized administrative actions. No active exploitation is recorded in CISA KEV, and EPSS indicates a 0.19% probability of near-term exploitation; however, a public researcher writeup exists on GitHub (FahadAljuaid), meaningfully raising practical risk.
Technical ContextAI
MailZen is a web-based email security management portal developed by Soliton Systems, a Japanese vendor. The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation - Stored or Reflected XSS), arising when user-supplied strings in account registration or profile fields (Role Name, First Name, Last Name, Username) are written to the database and later rendered in administrator-facing management views without adequate HTML encoding or output sanitization. The CVSS Scope:Changed metric confirms the payload crosses from the attacker-controlled browser context into the victim administrator's browser session, consistent with stored XSS behavior in a multi-user portal. CPE data provided is non-specific (cpe:2.3:a:n/a:n/a), indicating this product is not yet indexed in the NVD CPE dictionary, which limits automated vulnerability scanner coverage. The 'RCE' tag in the intelligence source refers to client-side JavaScript execution within the victim browser, not server-side remote code execution.
RemediationAI
No vendor-released patch has been identified at time of analysis - no fixed version number appears in the CVE description, EUVD record, or any referenced advisory. Organizations running MailZen 2.62 or 2.63 should monitor the Soliton Systems vendor channel and the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-51144 for patch availability. As compensating controls: restrict access to the MailZen Management Portal to trusted internal networks or VPN only, reducing the attacker's ability to submit malicious registrations from external sources. Implement a Web Application Firewall (WAF) rule set to detect and block common XSS payloads in POST request body parameters corresponding to the affected fields - note WAF evasion is possible and this is not a complete fix. Apply a strict Content-Security-Policy (CSP) response header to the management portal to limit the damage of injected scripts. Administrators should avoid clicking unknown links while authenticated to the portal until the vendor releases a fix.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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