CVE-2026-33923
Update bundle signature bypass in Guardian/CMC before 26.4.0
CVSS Score
7.2
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-347 |
| Vendor | nozomi networks |
| Product | guardian |
| Published | Oct 29, 2026 |
| Last Updated | Oct 29, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Nozomi Networks / Guardian
0 < 26.4.0
Nozomi Networks / CMC
0 < 26.4.0
References
Credits
This issue was found by Andrea Palanca of Nozomi Networks Product Security team during an internal investigation.