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CVE-2026-45021

Published May 28, 2026 CWE-346

Overview

CVE-2026-45021 is a known-severity vulnerability. It was published on May 28, 2026.

Technical Description

Kuma is a modern Envoy-based service mesh that can run on every cloud across both Kubernetes and VMs. Prior to 2.7.25, 2.9.15, 2.11.13, 2.12.10, and 2.13.5, the default kuma-cp config leaks the admin bootstrap token and signing keys to any webpage the operator visits while the control plane is reachable from their browser. CorsAllowedDomains: [".*"] reflects any Origin, and LocalhostIsAdmin: true promotes requests from 127.0.0.1 to mesh-system:admin. A cross-origin fetch() from a malicious page returns the admin JWT and signing material. This vulnerability is fixed in 2.7.25, 2.9.15, 2.11.13, 2.12.10, and 2.13.5.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHub github.com/kumahq/kuma/commit/8fefa8595d44eb68d922405702ed7a0826322907 GitHub github.com/kumahq/kuma/pull/16416 GitHub github.com/kumahq/kuma/pull/16423 GitHub github.com/kumahq/kuma/pull/16424 GitHub github.com/kumahq/kuma/pull/16425 GitHub github.com/kumahq/kuma/pull/16426 GitHub github.com/kumahq/kuma/pull/16427 GitHub github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2

Frequently Asked Questions

What is CVE-2026-45021?

CVE-2026-45021 is a known-severity vulnerability. It was published on May 28, 2026.

How severe is CVE-2026-45021?

CVSS score information is not yet available for this vulnerability. Check back as the CVE record is updated by NVD analysts.

How do I fix or remediate CVE-2026-45021?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-45021?

CyberStrike's AI-powered security agents can automatically detect CVE-2026-45021 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.

How CyberStrike Helps

Autonomous Discovery

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Continuous Pentesting

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Code Review

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HackBrowser

Browser-based exploitation validates findings with real proof-of-concept.
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