Critical 9.8Published Oct 7, 2026

CVE-2026-76455Cisco NX-OS Software Security Hardening Release: October 2026 - Improper Access Control Vulnerabilities

Updated under an hour ago (Oct 26, 2026, 4:50 PM ET)

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It affects Cisco NX-OS Software and 2 other products. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.28%, higher than 20% of scored CVEs.

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Every CVE for Cisco NX-OS Software

Exploited in the last 30 days

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: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-284
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.28% (percentile 20)
Assigned by: cisco
NVD analysis: Awaiting Analysis
Record last updated: Oct 7, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Cisco Cisco NX-OS Software cisco:nx_os_software (from the name)	8.2(5); 7.3(5)D1(1); 8.4(2); 8.4(3); 9.2(3); 8.2(1); 7.3(1)D1(1); 9.2(2v); and 138 more ranges	CNA record
Cisco Cisco NX-OS System Software in ACI Mode cisco:nx_os_system_software_in_aci_mode (from the name)	15.2(1g); 15.2(2e); 15.2(2f); 15.2(2g); 15.2(2h); 15.2(3f); 15.2(3e); 15.2(3g); and 53 more ranges	CNA record
Cisco Cisco Unified Computing System (Managed) cisco:unified_computing_system_managed (from the name)	4.0(1a); 4.1(1d); 4.0(4f); 4.0(4c); 4.0(2b); 4.1(2a); 4.0(4a); 4.0(4e); and 97 more ranges	CNA record

References

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-nxosw1-cWzSbtR

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.