CVE-2026-18678
Received Received - Intake

kumactl HTTPS Control Plane API Token Exposure via Disabled TLS Verification

Publication date: 2026-08-12

Last updated on: 2026-08-12

Assigner: Kong

Description
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 between the operator and the control plane can intercept user or admin API tokens and then act against the control plane as that user.

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Meta Information

Published
2026-08-12
Last Modified
2026-08-12
Generated
2026-08-13
AI Q&A
2026-08-12
EPSS Evaluated
N/A
NVD
CVE-2026-18678
EUVD
EUVD-2026-57425

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
kumahq kuma From 2.13.0 (inc) to 2.13.7 (exc)
konghq kong_mesh From 2.7.28 (inc) to 2.14.3 (inc)
kumahq kuma *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-295 The product does not validate, or incorrectly validates, a certificate.

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Executive Summary

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. This allows an attacker on the network path to intercept tokens and impersonate users or admins on the control plane.

Detection Guidance

Check if kumactl is configured with HTTPS profiles lacking CA certificates. Inspect kumactl configuration files for missing --ca-cert-file parameters in HTTPS control plane profiles. Monitor network traffic for unencrypted API token transmissions.

Impact Analysis

An attacker could intercept API tokens and gain unauthorized access to the control plane, potentially allowing them to perform actions as a legitimate user or admin. This could lead to data breaches, unauthorized changes, or service disruption.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating confidentiality requirements in GDPR and HIPAA. It may result in non-compliance due to potential data exposure and lack of proper access controls.

Mitigation Strategies

Update kumactl to patched versions (2.7.26, 2.9.16, 2.11.14, 2.12.11, or 2.13.7). When adding HTTPS profiles, always provide a CA certificate via --ca-cert-file. Replace custom CA certificates with publicly trusted ones if possible.

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