CVE-2026-76451 Cisco CVE debrief

Who should care

Defenders responsible for Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC) deployments should assess exposure and potential impact. This includes verifying if the affected products are in use, evaluating the potential for unauthorized data access or modification, and reviewing incident response plans to address potential SQL injection attacks.

Why it matters

CVE-2026-76451 is a SQL injection vulnerability in Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC) that requires verification of exposure and assessment of potential impact by defenders responsible for these deployments.

• Potential unauthorized data access or modification
• Possible disruption of identity services
• Required verification of administrative credential management
• Necessity to review and update incident response plans

Technical summary

A vulnerability in Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC) could allow an authenticated, remote attacker to conduct an SQL or HQL injection attack on an affected device. This vulnerability is due to insufficient validation of user-supplied input to the affected APIs before it is used to build database queries. An attacker could exploit this vulnerability by sending a crafted request to an affected device. A successful exploit could allow the attacker to execute arbitrary SQL or HQL queries against the underlying database, which could allow the attacker to view or modify data that they are not authorized to access.

Defensive priority

Defenders should prioritize verifying exposure and assessing potential impact.

Recommended defensive actions

• Verify exposure by checking if Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC) are in use and assess potential impact.
• Assess administrative credential management and API input validation.
• Review and update incident response plans to address potential SQL injection attacks.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE record and NVD entry provide details on the SQL injection vulnerability in Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC). The vulnerability is due to insufficient validation of user-supplied input to the affected APIs. Defenders should verify exposure and assess potential impact by checking if the affected products are in use, evaluating administrative credential management, and reviewing incident response plans.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.