CVE Alert: CVE-2026-20300 – Cisco

A vulnerability in Cisco ISE could allow an authenticated, remote attacker to conduct SQL injection attacks on an affected device. To exploit this vulnerability, the attacker must have at least low-privileged administrative credentials. This vulnerability is due to improper validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted request to an affected device. A successful exploit could allow the attacker to read or modify data in the underlying database.

Prioritise remediation promptly for internet-reachable or broadly accessible management interfaces, although the supplied data does not indicate active exploitation, KEV listing or a confirmed public proof of concept.

Successful abuse could expose sensitive access-control and authentication data or alter policy records, undermining network admission decisions and audit integrity. The realistic attacker goal is to gain a foothold in the management plane, manipulate who or what is trusted, and use resulting access to support wider intrusion activity.

### Most likely attack path

An attacker needs network reachability and valid low-privilege administrative credentials, but no victim interaction; low exploitation complexity makes credential theft, reuse or password spraying a credible precursor. Impact remains within the affected management system directly, yet altered identity policies or extracted data could enable lateral movement into protected network segments.

### Who is most exposed

Organisations exposing the administration portal to untrusted networks, remote-access infrastructure or large operator populations are most at risk. Large enterprises using the platform as a central policy engine face greater blast radius than isolated or tightly segmented deployments.

Review administrative requests containing SQL metacharacters, encoded operators or abnormal parameter lengths.

Alert on unusual query errors, response-size changes or bursts of failed administrative requests.

Correlate new administrator sessions with impossible travel, unfamiliar sources or recent credential resets.

Check for unexpected changes to network-access policies, identity stores and audit settings.

### Mitigation and prioritisation

Apply the vendor’s fixed software release through an expedited, tested change.

Restrict management access to dedicated administration networks, VPNs and allow-listed hosts.

Enforce MFA, remove dormant accounts and rotate credentials suspected of exposure.

Preserve logs and configuration backups before upgrading; validate policy integrity afterwards.

Obtain EPSS, KEV and SSVC status to refine urgency; their absence here leaves exploitation likelihood uncertain.

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