CVE-2026-76434 Cisco CVE debrief

Who should care

Cisco ISE and Cisco ISE-PIC administrators and security teams should assess exposure and apply patches to prevent potential data breaches. They should also review compensating controls for exposed systems while remediation is scheduled and verified. Additionally, they should check relevant monitoring, detection, and logs for exposed assets that need extra review.

Why it matters

CVE-2026-76434 is a medium-severity vulnerability in Cisco ISE and Cisco ISE-PIC that allows authenticated remote attackers to read arbitrary files. Cisco ISE and Cisco ISE-PIC administrators should verify and apply patches to prevent potential data breaches.

• Sensitive information disclosure
• Potential data breaches due to arbitrary file reads

Technical summary

A vulnerability in Cisco ISE and Cisco ISE-PIC allows authenticated remote attackers to read arbitrary files due to insufficient input validation. This vulnerability can lead to sensitive information disclosure and potential data breaches. The vulnerability is due to insufficient validation of user-supplied input by the affected feature. An attacker could exploit this vulnerability by sending a crafted request to the web-based management interface of an affected device. A successful exploit could allow the attacker to read arbitrary files from the affected device.

Defensive priority

Medium priority for Cisco ISE and Cisco ISE-PIC administrators to verify and apply patches.

Recommended defensive actions

• Verify and apply Cisco patches for Cisco ISE and Cisco ISE-PIC
• Restrict access to the web-based management interface
• Monitor for suspicious activity
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• 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 vulnerability in Cisco ISE and Cisco ISE-PIC. Cisco has provided a security advisory on their website. The vulnerability is due to insufficient validation of user-supplied input by the affected feature. An attacker could exploit this vulnerability by sending a crafted request to the web-based management interface of an affected device. A successful exploit could allow the attacker to read arbitrary files from the affected device, which could contain sensitive information. The CVE-202

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.