A Stored HTML Injection vulnerability was discovered in the Users functionality due to improper validation of an input parameter. An authenticated user with administrative privileges can create a malicious user whose username contains HTML tags. When a victim attempts to delete a group containing the affected user, 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.

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Advisories

No advisories yet.

Fixes

Solution

Upgrade to v26.1.0 or later.


Workaround

Use internal firewall features to limit access to the web management interface.

History

Tue, 19 May 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 19 May 2026 13:45:00 +0000

Type Values Removed Values Added
Description A Stored HTML Injection vulnerability was discovered in the Users functionality due to improper validation of an input parameter. An authenticated user with administrative privileges can create a malicious user whose username contains HTML tags. When a victim attempts to delete a group containing the affected user, 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.
Title HTML injection in Users in Guardian/CMC before 26.1.0
First Time appeared Nozomi Networks
Nozomi Networks cmc
Nozomi Networks guardian
Weaknesses CWE-79
CPEs cpe:2.3:a:nozomi_networks:cmc:*:*:*:*:*:*:*:*
cpe:2.3:a:nozomi_networks:guardian:*:*:*:*:*:*:*:*
Vendors & Products Nozomi Networks
Nozomi Networks cmc
Nozomi Networks guardian
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L'}

cvssV4_0

{'score': 4.8, '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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Nozomi

Published:

Updated: 2026-05-19T14:04:37.503Z

Reserved: 2025-04-16T09:04:35.923Z

Link: CVE-2025-40902

cve-icon Vulnrichment

Updated: 2026-05-19T14:04:07.086Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-05-19T14:16:27.960

Modified: 2026-05-19T14:37:55.490

Link: CVE-2025-40902

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses