EUVD-2026-17640Severity by source
AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Primary rating from Vendor (sonicwall) · only source for this CVE.
CVSS VectorVendor: sonicwall
Lifecycle Timeline
3DescriptionCVE.org
A stored Cross-Site Scripting (XSS) vulnerability has been identified in the SonicWall Email Security appliance due to improper neutralization of user-supplied input during web page generation, allowing a remote authenticated attacker as admin user to potentially execute arbitrary JavaScript code.
AnalysisAI
Stored Cross-Site Scripting (XSS) in SonicWall Email Security allows authenticated admin users to inject and execute arbitrary JavaScript code through improper input sanitization during web page generation. The vulnerability affects all versions of SonicWall Email Security appliance and requires admin-level authentication to exploit, limiting immediate exposure but posing significant risk to organizations where admin accounts are compromised or insider threats exist.
Technical ContextAI
The vulnerability stems from CWE-79 (Improper Neutralization of Input During Web Page Generation), a classic stored XSS flaw where user-supplied input is not properly sanitized before being stored and subsequently rendered in web pages. In the SonicWall Email Security appliance, the web management interface fails to encode or escape user input during form processing or configuration storage. When an authenticated admin user submits malicious JavaScript payload through the web interface, the payload is persisted in the appliance's database or configuration. When other users or admins view the affected page, the unescaped payload executes in their browser context with the privileges of the SonicWall management console, potentially allowing session hijacking, credential theft, or further compromise of email security infrastructure.
RemediationAI
Obtain and apply the vendor-released security patch from SonicWall via the PSIRT advisory at https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2026-0002. The advisory will specify the patched firmware version required for your Email Security appliance model. As an interim mitigation, restrict administrative access to the Email Security web console to trusted IP addresses or networks via firewall rules, enforce multi-factor authentication for all admin accounts, audit recent admin activities for signs of unauthorized configuration changes or suspicious entries in logs, and monitor email logs for signs of compromise. Verify that any user-supplied input to the Email Security appliance (custom signatures, allowlists, configuration fields) does not contain JavaScript or HTML markup; if such fields are visible in the management interface before patching, review them for malicious content.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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