# CVE-2026-33391: Nozomi Guardian/CMC incorrect authorization in Smart Polling configuration

Source: https://junglewise.ai/threats/cve-2026-33391-nozomi-guardian-cmc-incorrect-authorization-in-smart-polling  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-08. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-33391 · Severity: medium · CVSS 5.4 · Published 2026-09-08

Guardian and CMC are network monitoring and asset visibility products used by organizations to track and protect connected devices. A flaw in the Smart Polling configuration allows authenticated users with limited privileges to modify network discovery settings they should not be able to access, potentially hiding critical assets from monitoring and creating blind spots in network visibility.

Technologies: [Nozomi Networks Guardian](https://junglewise.ai/threats/technologies/guardian). Vendors: [Nozomi Networks](https://junglewise.ai/threats/vendors/nozomi-networks).

## Quick answers

**Is CVE-2026-33391 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-33391 being exploited in the wild.

**How severe is CVE-2026-33391?** Medium severity, with a CVSS score of 5.4, published 8 September 2026.

**Which products and versions are affected?** Nozomi Networks Guardian before 26.3.0.

**Is there a fix for CVE-2026-33391?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-33391 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-33391?** Check whether you run Nozomi Networks Guardian at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an incorrect authorization (CWE-863) issue in the Smart Polling configuration functionality of Guardian/CMC versions before 26.3.0. An authenticated user with limited privileges can bypass access control checks in the web management interface due to insufficient validation of user permissions. The vulnerability requires network access and valid user credentials but no additional user interaction. An attacker can exploit this to modify Smart Polling discovery configuration, disrupting asset visibility within the monitored network. The fix is available in version 26.3.0 and later.

## Affected products

- Nozomi Networks Guardian before 26.3.0
- Nozomi Networks CMC before 26.3.0

## Timeline

- 2026-09-08: disclosed

## References

- [https://security.nozominetworks.com/NN-2026:17-01](https://security.nozominetworks.com/NN-2026:17-01)

## Related threats

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- [Nozomi Networks Guardian/CMC and Arc improper certificate validation in Smart Polling](https://junglewise.ai/threats/cve-2026-33389-nozomi-networks-guardian-cmc-and-arc-improper-certificate)
- [Nozomi Networks Guardian/CMC incorrect authorization in Credentials Manager](https://junglewise.ai/threats/cve-2026-33388-nozomi-networks-guardian-cmc-incorrect-authorization-in)