CVE-2026-76499 Cisco CVE debrief

Who should care

Defenders responsible for Cisco APIC deployments should assess exposure and apply remediation. The vulnerability has a CVSS score of 9.8 and is due to improper neutralization issues. Defenders should prioritize verifying exposure and applying remediation for this critical vulnerability in Cisco APIC. Cisco APIC deployments are potentially affected, and defenders should assess exposure and apply remediation to prevent possible exploitation.

Why it matters

CVE-2026-76499 is a critical vulnerability in Cisco Application Policy Infrastructure Controller (APIC) that requires immediate attention from defenders. The vulnerability has a CVSS score of 9.8 and is due to improper neutralization issues. Defenders responsible for Cisco APIC deployments should assess exposure and apply remediation to prevent potential exploitation.

• Verify exposure and apply remediation to prevent potential exploitation
• Monitor for potential exploitation attempts to detect possible attacks
• Assess and update inventory of affected Cisco APIC versions

Technical summary

CVE-2026-76499 is a critical vulnerability in Cisco Application Policy Infrastructure Controller (APIC) due to improper neutralization issues, with a CVSS score of 9.8. The vulnerability affects Cisco APIC deployments, and defenders should assess exposure and apply remediation to prevent potential exploitation. The hardening release is part of Cisco's ongoing commitment to proactive security and product quality. Defenders should prioritize verifying exposure and applying remediation for this critical vulnerability in Cisco APIC.

Defensive priority

Defenders should prioritize verifying exposure and applying remediation for this critical vulnerability in Cisco APIC.

Recommended defensive actions

• Verify exposure by checking affected versions of Cisco APIC
• Apply remediation as recommended by Cisco
• Monitor for potential exploitation attempts
• 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
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and Cisco security advisory provide details on the vulnerability and affected versions. Defenders should verify exposure by checking affected versions of Cisco APIC and apply remediation as recommended by Cisco. The vulnerability has a CVSS score of 9.8 and is due to improper neutralization issues. The Cisco security advisory provides additional information on the vulnerability and remediation. Cisco APIC deployments are potentially affected, and defenders should assess exposure and apply remediation to prevent possible

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.