CVE-2026-31983

Missing authentication in SSH keys synchronization endpoint in Guardian/CMC before 26.2.0

Published Jul 9, 2026 CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

Description

A Missing Authentication vulnerability was discovered in the SSH keys synchronization endpoint. An unauthenticated attacker can send a request to the SSH keys synchronization endpoint and obtain the list of users that have uploaded their public SSH keys, their groups, and the uploaded public SSH keys.

Analysis

Technical impact

A missing authentication flaw exists in the SSH keys synchronization endpoint of Nozomi Networks’ CMC Guardian products. Based on the description, it is inferred that an unauthenticated attacker who can reach the web‑management interface can send a request to this endpoint and retrieve a list of users who have uploaded public SSH keys, the groups those users belong to, and the public key data itself. The disclosed information includes usernames, group memberships, and key material, exposing sensitive configuration details.

Affected Systems

The vulnerability affects Nozomi Networks CMC and Guardian running a version earlier than 26.2.0. Deployments using these products should confirm their version and determine whether the endpoint is exposed to potential attackers.

Risk and Exploitability

The CVSS score of 6.9 indicates moderate severity, while the EPSS score of <1% suggests a very low probability of exploitation at this time. The vulnerability is not listed in the CISA KEV catalog. Based on the description, the likely attack vector is an attacker who can reach the web‑management interface; reaching the synchronization endpoint is sufficient to exploit the flaw due to lack of authentication.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Nozomi Networks

Guardian

unaffected

Version	Status	Constraints
`0`	affected	< 26.2.0

Nozomi Networks

CMC

unaffected

Version	Status	Constraints
`0`	affected	< 26.2.0

Configuration 1 [-]

OR	cpe:2.3:a:nozominetworks:cmc::::::::
	cpe:2.3:a:nozominetworks:guardian::::::::

No data.

Vendor Product Versions

Nozomi Networks

Cmc

Version	Status	Scheme	Platform
`[0,26.2.0)`	affected	semver	—

Nozomi Networks

Guardian

Version	Status	Scheme	Platform
`[0,26.2.0)`	affected	semver	—

Remediation

Vendor Solution

Upgrade to v26.2.0 or later.

Vendor Workaround

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

OpenCVE Recommended Actions

Upgrade to v26.2.0 or later.
Restrict external network access to the web‑management interface using internal firewall or network segmentation.
Use internal firewall features to limit access to the web management interface.

Generated by OpenCVE AI on August 1, 2026 at 14:50 UTC.

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.441% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://cert-portal.siemens.com/productcert/html/ssa-827968.html
https://security.nozominetworks.com/NN-2026:10-01

History

Aug 11, 2026 4:00 PM Added references View changes

Type	Values Removed	Values Added
References		https://cert-portal.siemens.com/productcert/html/ssa-827968.html

Jul 9, 2026 1:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Jul 9, 2026 8:15 AM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		A Missing Authentication vulnerability was discovered in the SSH keys synchronization endpoint. An unauthenticated attacker can send a request to the SSH keys synchronization endpoint and obtain the list of users that have uploaded their public SSH keys, their groups, and the uploaded public SSH keys.
Title		Missing authentication in SSH keys synchronization endpoint in Guardian/CMC before 26.2.0
First Time appeared		Nozomi Networks Nozomi Networks cmc Nozomi Networks guardian
Weaknesses		CWE-306
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		https://security.nozominetworks.com/NN-2026:10-01
Metrics		cvssV3_1 `{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}` cvssV4_0 `{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'}`