EUVD-2026-94460
GHSA-q7hw-286v-vv3w
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Authentication-bypass/access-control flaw reachable over the network with no credentials or interaction (AV:N/AC:L/PR:N/UI:N); vendor-asserted full C/I/A impact retained given no detail to narrow it.
Primary rating from Vendor (cisco).
CVSS VectorVendor: cisco
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Improper access control in Cisco NX-OS - including NX-OS running in ACI mode and the NX-OS component of managed Cisco Unified Computing System deployments - could allow a remote, unauthenticated attacker to bypass access restrictions and achieve full compromise of confidentiality, integrity, and availability (CVSS 3.1 9.8, AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). The issue was identified during a Cisco internal security review and is addressed in a NX-OS software hardening release rather than a single-point bug fix, with the advisory grouping multiple internally discovered access-control weaknesses under CVE-2026-76455. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The input provides no concrete technical prerequisites - the description is a generic hardening-release summary stating only that CVE-2026-76455 covers improper access control (CWE-284) issues, with no named feature, protocol, port, or configuration mode. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H = 9.8 Critical) describes a network-reachable, low-complexity, unauthenticated flaw with total confidentiality, integrity, and availability impact - on paper a top-priority issue, reinforced by the 'Authentication Bypass' tag against CWE-284 improper access control. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Patch available per vendor advisory: Cisco states that an internal security review produced a software hardening release that remediates the vulnerabilities tracked by CVE-2026-76455, so the primary action is to upgrade NX-OS (including ACI-mode and UCS-managed instances) to the fixed release identified in Cisco advisory cisco-sa-hardening-nxosw1-cWzSbtR at https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-nxosw1-cWzSbtR; the exact patched version string is not specified in the provided input and must be taken from that advisory. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, validate whether your environment is exposed by checking the Cisco advisory for CVE-2026-76455 and inventorying all Cisco NX-OS devices, including NX-OS running in ACI mode and the NX-OS component of managed Cisco Unified Computing System deployments; restrict management-plane access to trusted networks and jump hosts, enforce MFA where supported, and review logs for anomalous access-control bypass attempts. …
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Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
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External POC / Exploit Code
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