CVE-2026-76455: Improper Access Control in Cisco Cisco NX-OS Software
Description
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.
CVSS v3.1
Score 9.8critical
Affected software
Cisco
Cisco NX-OS Software
Cisco
Cisco NX-OS System Software in ACI Mode
Cisco
Cisco Unified Computing System (Managed)
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Cisco NX-OS Software contains improper access control vulnerabilities grouped under CWE-284, discovered during an internal security review. These issues allow unauthorized access that can compromise system confidentiality, integrity, and availability. The vulnerability is tracked as CVE-2026-76455 and has a CVSS 3.1 base score of 9.8, reflecting network attack vector, low attack complexity, no privileges required, no user interaction, and high impact on confidentiality, integrity, and availability. No detailed affected versions or patch information is available in the provided data.
Potential Impact
Exploitation of this vulnerability could allow an unauthenticated attacker to gain unauthorized access to Cisco NX-OS devices, potentially leading to full compromise of device confidentiality, integrity, and availability. The critical CVSS score reflects the severity of these impacts.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Cisco has released a software hardening update addressing multiple vulnerabilities including this one, so applying the latest Cisco NX-OS software updates once available is recommended.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- cisco
- Date Reserved
- 2026-08-19T12:02:03.636Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac674882cdf04f656647329
Added to database: 10/07/2026, 16:34:16 UTC
Last enriched: 10/07/2026, 16:51:39 UTC
Last updated: 10/08/2026, 05:48:07 UTC
Views: 13
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