Vulnerability · Published Oct 29, 2026 · Assigned by Nozomi
CVE-2026-33923Update bundle signature bypass in Guardian/CMC before 26.4.0
High 7.2
In plain English
A high-severity security flaw in CMC from Nozomi Networks. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Nozomi Networks | Guardian | 0 – before 26.4.0 |
| Nozomi Networks | CMC | 0 – before 26.4.0 |
Weakness: CWE-347 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H