Medium 5.1Published May 28, 2026

CVE-2026-45021Kuma: Default kuma-cp leaks admin token cross-origin via CORS wildcard + LocalhostIsAdmin

Updated under an hour ago (Oct 28, 2026, 6:30 AM ET)

Does this affect you?

It affects kumahq kuma. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for kumahq kuma

Exploited in the last 30 days

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.

CVSS: 5.1 MEDIUM (v4.0, 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
Weakness (CWE): CWE-346, CWE-942
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: May 28, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

kumahq kuma kumahq:kuma (from the name)	before 2.7.25; from 2.9.0, < 2.9.15; from 2.11.0, < 2.11.13; from 2.12.0, < 2.12.10; from 2.13.0, < 2.13.5	CNA record

References

References

https://github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2	x-refsource-confirm
https://github.com/kumahq/kuma/pull/16416	x-refsource-misc
https://github.com/kumahq/kuma/pull/16423	x-refsource-misc
https://github.com/kumahq/kuma/pull/16424	x-refsource-misc
https://github.com/kumahq/kuma/pull/16425	x-refsource-misc
https://github.com/kumahq/kuma/pull/16426	x-refsource-misc
https://github.com/kumahq/kuma/pull/16427	x-refsource-misc
https://github.com/kumahq/kuma/commit/8fefa8595d44eb68d922405702ed7a0826322907	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.