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CVE-2026-45021

MEDIUM
5.1
CVSS 4.0
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.

Metadata

CVE ID
CVE-2026-45021
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-05-08 16:58 UTC
Published
2026-05-28 17:45 UTC
Last updated
2026-05-28 19:30 UTC
Primary CWE
CWE-346
CWE-346: Origin Validation Error
Vendor / Product
kumahq / kuma
Sources
cve.org  ·  NVD

Severity & Metrics

5.1 MEDIUM CVSS 4.0
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
SSVC — CISA Coordinator
Exploitation
none
Automatable
yes
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
kumahq kuma — < 2.7.25, >= 2.9.0, < 2.9.15, >= 2.11.0, < 2.11.13, >= 2.12.0, < 2.12.10 …
Weakness (CWE)
CWESourceDescription
CWE-346 cna CWE-346: Origin Validation Error
CWE-942 cna CWE-942: Permissive Cross-domain Policy with Untrusted Domains
CVSS scores (1)
ScoreSeverityVersionSourceVector
5.1 MEDIUM 4.0 cna 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 (8)
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