CVE-2026-76427 Cisco CVE debrief

Who should care

Defenders responsible for Cisco ISE deployments, especially those with remote administrative access, should assess their exposure and potential impact. This includes administrators, security teams, and IT personnel managing Cisco ISE systems.

Why it matters

CVE-2026-76427 is a medium-severity vulnerability in Cisco ISE that allows authenticated remote attackers to read arbitrary files. Defenders should verify exposure, restrict administrative access, and monitor for suspicious activity.

• Potential unauthorized file reads on affected devices
• Possible exposure of sensitive information
• Need for verification of Cisco ISE version and patch level
• Potential for lateral movement within the network

Technical summary

The vulnerability exists in the offline profiler feed service of Cisco ISE due to the use of an XML parser that does not disable external entity resolution. This allows an authenticated, remote attacker with administrative credentials to read arbitrary files on the affected device by uploading a crafted offline feed package. The attacker must have valid administrative credentials to exploit this vulnerability. Cisco ISE deployments, especially those with remote administrative access, are potentially impacted. Defenders should assess their exposure and implement compensating controls to mitigate potential damage.

Defensive priority

Defenders should prioritize verifying exposure in their Cisco ISE deployments, especially those with administrative access exposed to remote attackers. They should also assess the potential impact of arbitrary file reads on their systems.

Recommended defensive actions

• Verify Cisco ISE version and patch level to determine exposure
• Restrict administrative access to the offline profiler feed service
• Implement additional monitoring for suspicious file access requests
• Review and apply Cisco's security advisories for remediation guidance
• Conduct a thorough review of system logs for potential exploitation
• Inventory Cisco ISE deployments for asset management and prioritization
• Plan for immediate patching or mitigation of vulnerable Cisco ISE systems

Evidence notes

The CVE record and NVD entry provide details about the vulnerability, including its description, CVSS score, and affected versions. However, the record does not provide information on known exploitation or specific remediation steps beyond vendor advisories.

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.