Cisco Nexus Dashboard up to 4.2.1 missing authentication

Summaryinfo

A vulnerability, which was classified as very critical, has been found in Cisco Nexus Dashboard. This issue affects some unknown processing. Performing a manipulation results in missing authentication. This vulnerability was named CVE-2026-20326. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Cisco Nexus Dashboard. It has been classified as very critical. This affects an unknown functionality. The manipulation with an unknown input leads to a missing authentication vulnerability. CWE is classifying the issue as CWE-306. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Nexus Dashboard 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-2026-20326 are related to missing authentication for critical function issues that are grouped under the Common Weakness Enumeration (CWE) CWE-306.

The advisory is shared at sec.cloudapps.cisco.com. This vulnerability is uniquely identified as CVE-2026-20326 since 10/08/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/16/2026).

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Forum Software

Vendor

• Cisco

Name

• Nexus Dashboard

Version

• 2.1(1d)
• 2.1(1e)
• 2.1(2d)
• 2.1(2f)
• 2.2(1e)
• 2.2(1h)
• 2.2(2d)
• 2.3(1c)
• 2.3(2b)
• 2.3(2c)
• 2.3(2d)
• 2.3(2e)
• 3.0(1f)
• 3.0(1i)
• 3.1(1k)
• 3.1(1l)
• 3.1(1n)
• 3.2(1e)
• 3.2(1i)
• 3.2(2f)
• 3.2(2g)
• 3.2(2m)
• 3.3(1a)
• 3.3(1b)
• 3.3(2b)
• 3.3(2g)
• 4.0(1i)
• 4.1(1g)
• 4.2.1

License

• commercial

Website

• Vendor: https://www.cisco.com/

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