Description
A signature verification vulnerability was discovered in the update installation functionality due to inconsistent validation of the update bundle contents. An attacker with administrative privileges can remotely supply a crafted update bundle that passes signature verification but runs an unsigned script when the bundle is installed. The script runs with root privileges, allowing the attacker to read or modify sensitive data, change the appliance configuration, or shut down the appliance.
Published: 2026-10-29
Score: 7.5 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Solution

Upgrade to v26.4.0 or later.


Vendor Workaround

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

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Thu, 29 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Thu, 29 Oct 2026 11:00:00 +0000

Type Values Removed Values Added
Description A signature verification vulnerability was discovered in the update installation functionality due to inconsistent validation of the update bundle contents. An attacker with administrative privileges can remotely supply a crafted update bundle that passes signature verification but runs an unsigned script when the bundle is installed. The script runs with root privileges, allowing the attacker to read or modify sensitive data, change the appliance configuration, or shut down the appliance.
Title Update bundle signature bypass in Guardian/CMC before 26.4.0
First Time appeared Nozomi Networks
Nozomi Networks cmc
Nozomi Networks guardian
Weaknesses CWE-347
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': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 7.5, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


Subscriptions

Nozomi Networks Cmc Guardian
cve-icon MITRE

Status: PUBLISHED

Assigner: Nozomi

Published:

Updated: 2026-10-29T12:36:53.310Z

Reserved: 2026-03-24T16:06:11.951Z

Link: CVE-2026-33923

cve-icon Vulnrichment

Updated: 2026-10-29T12:30:13.690Z

cve-icon NVD

Status : Received

Published: 2026-10-29T11:17:32.847

Modified: 2026-10-29T13:17:10.847

Link: CVE-2026-33923

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-29T13:45:17Z

Weaknesses
  • CWE-347

    Improper Verification of Cryptographic Signature