Cisco has published an urgent security advisory detailing a critical authentication bypass vulnerability in its Integrated Management Controller (IMC) software, warning enterprise administrators of the severe risk posed to their server infrastructure.
CVE-2026-20093: What You Need to Know
Tracked as CVE-2026-20093, the flaw carries a maximum-impact CVSS 3.1 base score of 9.8 out of 10, placing it among the most severe vulnerabilities disclosed by Cisco in recent months.
The root cause lies in the IMC’s change password functionality, which fails to properly handle and validate user password change requests, a critical oversight that opens the door to full system compromise.
An unauthenticated, remote attacker can exploit this weakness by sending a specially crafted HTTP request directly to the management interface of a vulnerable device.
Upon successful exploitation, the attacker can silently overwrite the credentials of any existing system user, including top-level Admin accounts, and gain unrestricted administrative control over the affected hardware.
Because Cisco IMC operates as an out-of-band management controller, functioning independently from the host operating system, a successful compromise grants attackers persistent access that can survive host OS reboots and re-imaging.
The security researcher known as “jyh” is credited with responsibly discovering and reporting this dangerous flaw to the Cisco Product Security Incident Response Team (PSIRT).
Cisco has confirmed that, as of this writing, there are no known public exploits or active in-the-wild exploitation campaigns targeting CVE-2026-20093.
Affected Hardware
This vulnerability impacts a wide range of enterprise-grade Cisco hardware running vulnerable IMC software versions, regardless of device configuration or deployment mode.
The primary affected platforms include:
- 5000 Series Enterprise Network Compute Systems (ENCS)
- Catalyst 8300 Series Edge uCPE platforms
- UCS C-Series M5 and M6 Rack Servers (standalone deployments)
- UCS E-Series M3 and M6 server models
Beyond standalone servers, numerous preconfigured Cisco network appliances that expose the IMC user interface are also at risk.
These include Application Policy Infrastructure Controller (APIC) servers, Catalyst Center Appliances, Secure Firewall Management Center Appliances, and Secure Network Analytics Appliances, all widely deployed across enterprise and data center environments.
Cisco has explicitly stated that no workarounds or temporary network mitigations exist for CVE-2026-20093.
The only path to full remediation is upgrading to the patched software releases detailed in the official Cisco security advisory.
Depending on the hardware in use, administrators must apply fixes via the automated NFVIS upgrade process, the Cisco Hst Upgrade Utility (HUU), or specialized out-of-band update procedures.
Given the critical severity rating and the complete absence of mitigation alternatives, security teams are strongly urged to audit all IMC-exposed devices and apply vendor-issued patches without delay.
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