CVE-2025-40903 MEDIUM

CVE-2025-40903: HTML injection in Schedule Restore Archive in Guardian/CMC before 26.1.0

Vendor Nozomi Networks
Product Guardian
Weakness CWE-79 · XSS
Published May 19, 2026
Last update June 9, 2026

CVSS base score

4.8/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L

What the vulnerability does

01Description

A Stored HTML Injection vulnerability was discovered in the Schedule Restore Archive functionality due to improper validation of an input parameter. An authenticated user with administrative privileges can define a malicious restore schedule containing HTML tags. When a victim views the affected schedule, the injected HTML renders in their browser, enabling phishing and possibly open redirect attacks. Full XSS exploitation and direct information disclosure are prevented by the existing input validation and Content Security Policy configuration.

Key dates

02Disclosure timeline

May 19, 2026 CVE published
June 9, 2026 Record updated