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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-45021 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

Nist CVSS score does not match with CNA score
CNA:  GitHub, Inc.
CVSS-B 5.1 MEDIUM
Vector:  CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/kumahq/kuma/commit/8fefa8595d44eb68d922405702ed7a0826322907 GitHub, Inc.
https://github.com/kumahq/kuma/pull/16416 GitHub, Inc.
https://github.com/kumahq/kuma/pull/16423 GitHub, Inc.
https://github.com/kumahq/kuma/pull/16424 GitHub, Inc.
https://github.com/kumahq/kuma/pull/16425 GitHub, Inc.
https://github.com/kumahq/kuma/pull/16426 GitHub, Inc.
https://github.com/kumahq/kuma/pull/16427 GitHub, Inc.
https://github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2 GitHub, Inc.

Weakness Enumeration

CWE-ID CWE Name Source
CWE-346 Origin Validation Error GitHub, Inc.  
CWE-942 Permissive Cross-domain Policy with Untrusted Domains GitHub, Inc.  

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-45021
NVD Published Date:
05/28/2026
NVD Last Modified:
05/28/2026
Source:
GitHub, Inc.