CVE-2026-18678 Kong Inc. CVE debrief

Who should care

Operators and administrators using kumactl to manage control planes should be aware of this vulnerability and take steps to verify their configurations and ensure proper TLS verification is in place. Additionally, security teams monitoring for potential token interception attacks should be aware of this vulnerability and its potential impact.

Technical summary

The CVE-2026-18678 vulnerability exists in kumactl when an operator adds an HTTPS control plane profile without providing a CA certificate. This causes kumactl to disable TLS verification, allowing API tokens to be sent over an unverified connection. An attacker on the network path between the operator and the control plane can intercept these tokens and use them to act against the control plane as the user or admin whose token was intercepted.

Defensive priority

Operators and administrators using kumactl should prioritize verifying their configurations and ensuring proper TLS verification is in place.

Recommended defensive actions

• Verify kumactl configurations to ensure proper TLS verification is enabled.
• Implement proper certificate validation for HTTPS control plane profiles.
• Monitor for suspicious activity related to API token interception.
• Consider implementing compensating controls, such as additional authentication mechanisms.
• 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.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record indicates that when an operator adds an HTTPS control plane profile to kumactl without providing a CA certificate, kumactl disables TLS verification and sends API tokens over the unverified connection. An attacker on the network path can intercept user or admin API tokens and act against the control plane as that user. However, details about affected versions, patches, or workarounds are not provided in the CVE record.

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.