CVE-2026-76455 PUBLISHED

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

Assigner: cisco
Reserved: 19.08.2026 Published: 07.10.2026 Updated: 08.10.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 9.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	Cisco
Product	Cisco NX-OS Software
Versions	Default: unknown Version 8.2(5) is affected Version 7.3(5)D1(1) is affected Version 8.4(2) is affected Version 8.4(3) is affected Version 9.2(3) is affected Version 8.2(1) is affected Version 7.3(1)D1(1) is affected Version 9.2(2v) is affected Version 7.3(0)D1(1) is affected Version 7.3(4)D1(1) is affected Version 9.2(1) is affected Version 9.2(2t) is affected Version 9.2(3y) is affected Version 9.3(2) is affected Version 7.3(1)DY(1) is affected Version 8.1(1) is affected Version 8.2(2) is affected Version 8.3(2) is affected Version 7.3(2)D1(3a) is affected Version 9.2(4) is affected Version 8.1(2) is affected Version 7.3(3)D1(1) is affected Version 8.2(3) is affected Version 8.3(1) is affected Version 8.4(1) is affected Version 8.1(1b) is affected Version 7.3(0)DX(1) is affected Version 7.3(2)D1(1) is affected Version 9.3(1) is affected Version 7.3(2)D1(2) is affected Version 8.2(4) is affected Version 7.3(0)DY(1) is affected Version 9.3(1z) is affected Version 9.2(2) is affected Version 8.1(2a) is affected Version 7.3(2)D1(3) is affected Version 8.1(1a) is affected Version 8.4(1a) is affected Version 9.3(3) is affected Version 7.3(2)D1(1d) is affected Version 9.3(4) is affected Version 7.3(6)D1(1) is affected Version 8.2(6) is affected Version 9.3(5) is affected Version 8.4(2a) is affected Version 8.4(2b) is affected Version 8.5(1) is affected Version 9.3(6) is affected Version 8.4(4) is affected Version 7.3(7)D1(1) is affected Version 8.4(2c) is affected Version 9.3(5w) is affected Version 8.2(7) is affected Version 9.3(7) is affected Version 9.3(7k) is affected Version 7.3(8)D1(1) is affected Version 9.3(7a) is affected Version 8.2(7a) is affected Version 9.3(8) is affected Version 8.4(4a) is affected Version 8.4(2d) is affected Version 8.4(5) is affected Version 8.2(8) is affected Version 9.3(9) is affected Version 7.3(9)D1(1) is affected Version 8.4(6) is affected Version 8.4(2e) is affected Version 9.3(10) is affected Version 9.2(1a) is affected Version 8.2(9) is affected Version 10.3(1) is affected Version 8.4(7) is affected Version 10.3(2) is affected Version 8.4(6a) is affected Version 9.3(11) is affected Version 10.3(3) is affected Version 9.4(1) is affected Version 9.3(2a) is affected Version 8.4(2f) is affected Version 8.2(10) is affected Version 9.3(12) is affected Version 10.4(1) is affected Version 8.4(8) is affected Version 10.3(99w) is affected Version 10.3(3w) is affected Version 10.3(99x) is affected Version 10.3(3o) is affected Version 8.4(9) is affected Version 10.3(4) is affected Version 10.3(3p) is affected Version 10.3(4a) is affected Version 9.4(1a) is affected Version 10.4(2) is affected Version 10.3(3q) is affected Version 9.3(13) is affected Version 8.2(11) is affected Version 9.4(2) is affected Version 10.3(5) is affected Version 10.4(3) is affected Version 10.3(3x) is affected Version 10.3(4g) is affected Version 10.5(1) is affected Version 8.4(10) is affected Version 9.4(2a) is affected Version 10.3(3r) is affected Version 10.3(6) is affected Version 9.3(14) is affected Version 10.4(4) is affected Version 10.3(4h) is affected Version 10.5(2) is affected Version 10.5(1j) is affected Version 8.4(11) is affected Version 9.4(3) is affected Version 10.3(7) is affected Version 10.4(5) is affected Version 10.5(3) is affected Version 9.3(15) is affected Version 9.4(3a) is affected Version 10.4(4g) is affected Version 10.5(4) is affected Version 9.4(3b) is affected Version 8.4(12) is affected Version 10.6(1) is affected Version 10.5(3t) is affected Version 10.3(8) is affected Version 10.4(6) is affected Version 10.5(3s) is affected Version 10.5(3e) is affected Version 9.4(4) is affected Version 10.5(3o) is affected Version 9.3(16) is affected Version 10.6(1s) is affected Version 10.6(2) is affected Version 10.5(3p) is affected Version 9.4(5) is affected Version 10.3(9) is affected Version 10.6(2s) is affected Version 8.4(13) is affected Version 10.6(3) is affected Version 10.4(7) is affected Version 10.5(5) is affected Version 9.3(17) is affected Version 10.6(2n) is affected Version 10.6(3q) is affected Version 10.6(3o) is affected Version 10.6(3s) is affected

Vendor	Cisco
Product	Cisco NX-OS System Software in ACI Mode
Versions	Default: unknown Version 15.2(1g) is affected Version 15.2(2e) is affected Version 15.2(2f) is affected Version 15.2(2g) is affected Version 15.2(2h) is affected Version 15.2(3f) is affected Version 15.2(3e) is affected Version 15.2(3g) is affected Version 15.2(4d) is affected Version 15.2(4e) is affected Version 15.2(5c) is affected Version 15.2(5d) is affected Version 16.0(1g) is affected Version 15.2(5e) is affected Version 15.2(4f) is affected Version 15.2(6e) is affected Version 15.2(6h) is affected Version 16.0(1j) is affected Version 15.2(6g) is affected Version 15.2(7f) is affected Version 15.2(7g) is affected Version 16.0(2h) is affected Version 15.2(8d) is affected Version 16.0(2j) is affected Version 15.2(8e) is affected Version 16.0(3d) is affected Version 16.0(3e) is affected Version 15.2(8f) is affected Version 15.2(8g) is affected Version 15.3(1d) is affected Version 15.2(8h) is affected Version 16.0(4c) is affected Version 15.3(2a) is affected Version 15.2(8i) is affected Version 16.0(5h) is affected Version 15.3(2b) is affected Version 16.0(3g) is affected Version 16.0(5j) is affected Version 15.3(2c) is affected Version 16.0(6c) is affected Version 15.3(2d) is affected Version 16.1(1f) is affected Version 16.0(7e) is affected Version 16.0(8e) is affected Version 15.3(2e) is affected Version 16.0(8f) is affected Version 16.1(2f) is affected Version 16.1(2g) is affected Version 15.3(2f) is affected Version 16.0(9c) is affected Version 16.1(3f) is affected Version 16.0(9d) is affected Version 16.0(6h) is affected Version 16.0(8h) is affected Version 16.1(3g) is affected Version 16.0(9e) is affected Version 16.1(4h) is affected Version 16.1(5e) is affected Version 16.2(1g) is affected Version 16.0(9f) is affected Version 16.2(2e) is affected

Vendor	Cisco
Product	Cisco Unified Computing System (Managed)
Versions	Default: unknown Version 4.0(1a) is affected Version 4.1(1d) is affected Version 4.0(4f) is affected Version 4.0(4c) is affected Version 4.0(2b) is affected Version 4.1(2a) is affected Version 4.0(4a) is affected Version 4.0(4e) is affected Version 4.0(4h) is affected Version 4.0(2a) is affected Version 4.1(1c) is affected Version 4.0(1b) is affected Version 4.1(1e) is affected Version 4.0(4d) is affected Version 4.0(4b) is affected Version 4.0(2e) is affected Version 4.1(1a) is affected Version 4.0(4g) is affected Version 4.0(1d) is affected Version 4.0(1c) is affected Version 4.0(4i) is affected Version 4.0(2d) is affected Version 4.1(1b) is affected Version 4.1(2b) is affected Version 4.0(4k) is affected Version 4.1(3a) is affected Version 4.1(3b) is affected Version 4.1(2c) is affected Version 4.0(4l) is affected Version 4.1(4a) is affected Version 4.1(3c) is affected Version 4.1(3d) is affected Version 4.2(1c) is affected Version 4.2(1d) is affected Version 4.0(4m) is affected Version 4.1(3e) is affected Version 4.2(1f) is affected Version 4.1(3f) is affected Version 4.2(1i) is affected Version 4.1(3h) is affected Version 4.2(1k) is affected Version 4.2(1l) is affected Version 4.0(4n) is affected Version 4.2(1m) is affected Version 4.1(3i) is affected Version 4.2(2a) is affected Version 4.2(1n) is affected Version 4.1(3j) is affected Version 4.2(2c) is affected Version 4.2(2d) is affected Version 4.2(3b) is affected Version 4.1(3k) is affected Version 4.0(4o) is affected Version 4.2(2e) is affected Version 4.2(3d) is affected Version 4.2(3e) is affected Version 4.2(3g) is affected Version 4.1(3l) is affected Version 4.3(2b) is affected Version 4.2(3h) is affected Version 4.2(3i) is affected Version 4.3(2c) is affected Version 4.1(3m) is affected Version 4.3(2e) is affected Version 4.3(3a) is affected Version 4.2(3j) is affected Version 4.3(3c) is affected Version 4.3(4a) is affected Version 4.2(3k) is affected Version 4.3(4b) is affected Version 4.3(4c) is affected Version 4.2(3l) is affected Version 4.3(4d) is affected Version 4.3(2f) is affected Version 4.2(3m) is affected Version 4.3(5a) is affected Version 4.3(4e) is affected Version 4.1(3n) is affected Version 4.3(4f) is affected Version 4.2(3n) is affected Version 4.3(5c) is affected Version 4.2(3o) is affected Version 4.3(5d) is affected Version 4.3(6a) is affected Version 4.3(6b) is affected Version 4.3(5e) is affected Version 4.3(6c) is affected Version 4.2(3p) is affected Version 6.0(1b) is affected Version 6.0(1c) is affected Version 4.3(6d) is affected Version 6.0(1d) is affected Version 6.0(1e) is affected Version 4.3(6e) is affected Version 6.0(1f) is affected Version 4.3(6f) is affected Version 6.0(2b) is affected Version 6.0(1h) is affected Version 4.2(3r) is affected Version 6.0(2c) is affected Version 4.3(6g) is affected Version 6.0(2d) is affected Version 4.3(6h) is affected Version 4.2(3s) is affected Version 4.3(6i) is affected

Exploits

The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.

References

cisco-sa-hardening-nxosw1-cWzSbtR

Problem Types

Improper Access Control cwe