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.
Published: 2026-05-19
Score: 4.8 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Solution

Upgrade to v26.1.0 or later.


Vendor Workaround

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

Tracking

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Advisories

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History

Tue, 09 Jun 2026 10:30:00 +0000

Type Values Removed Values Added
References

Tue, 19 May 2026 17:45:00 +0000

Type Values Removed Values Added
First Time appeared Nozominetworks
Nozominetworks cmc
Nozominetworks guardian
CPEs cpe:2.3:a:nozominetworks:cmc:*:*:*:*:*:*:*:*
cpe:2.3:a:nozominetworks:guardian:*:*:*:*:*:*:*:*
Vendors & Products Nozominetworks
Nozominetworks cmc
Nozominetworks guardian

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'}


Subscriptions

Nozomi Networks Cmc Guardian
Nozominetworks Cmc Guardian
cve-icon MITRE

Status: PUBLISHED

Assigner: Nozomi

Published:

Updated: 2026-06-09T09:02:25.919Z

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

Link: CVE-2025-40902

cve-icon Vulnrichment

Updated: 2026-06-09T09:02:25.919Z

cve-icon NVD

Status : Modified

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

Modified: 2026-06-17T09:22:15.317

Link: CVE-2025-40902

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-19T15:15:07Z

Weaknesses