Cisco NX-OS Software access control

Summaryinfo

A vulnerability was found in Cisco NX-OS Software, NX-OS System Software in ACI Mode and Unified Computing System and classified as very critical. This affects an unknown part. Such manipulation leads to access control. This vulnerability is documented as CVE-2026-76455. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Cisco NX-OS Software, NX-OS System Software in ACI Mode and Unified Computing System (the affected version is unknown) and classified as very critical. Affected by this issue is an unknown code. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability. CVE summarizes:

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco NX-OS engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-76455 are related to improper access control issues that are grouped under the Common Weakness Enumeration (CWE) CWE-284.

The advisory is shared for download at sec.cloudapps.cisco.com. This vulnerability is handled as CVE-2026-76455 since 08/19/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 10/07/2026). The MITRE ATT&CK project declares the attack technique as T1068.

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Virtualization Software

Vendor

• Cisco

Name

• NX-OS Software
• NX-OS System Software in ACI Mode
• Unified Computing System

License

• commercial

Website

• Vendor: https://www.cisco.com/

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