CVE-2026-18676
Medium
Description
The default kuma-cp configuration in Kong Mesh reveals the admin bootstrap token and signing keys to any webpage the operator visits while the control plane is reachable from their browser. Due to a CORS misconfiguration a cross-origin fetch() from a malicious page returns the admin JWT and signing material.
SeverityMedium
CVSS5.1
Exploit probability—
ProductGithub.com/kumahq/kuma
PublishedAug 12, 2026
First seenAug 12, 2026
Weakness typeCWE-346CWE-346CWE-942CWE-942
How to fix
Update
- github.com/kumahq/kuma2.7.25, 2.9.15, 2.11.13, 2.12.10, 2.13.5 or later
- github.com/kumahq/kuma/v22.7.25, 2.11.13, 2.12.10, 2.13.5 or later
Patches
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github.com/kumahq/kumaGo | v < 2.7.25, 2.9.0 ≤ v < 2.9.15, 2.11.0 ≤ v < 2.11.13, 2.12.0 ≤ v < 2.12.10, 2.13.0 ≤ v < 2.13.5, No range specified | 2.7.25, 2.9.15, 2.11.13, 2.12.10, 2.13.5 |
| github.com/kumahq/kuma/v2Go | v < 2.7.25, 2.9.13 ≤ v < 2.11.13, 2.12.4 ≤ v < 2.12.10, 2.13.0 ≤ v < 2.13.5 | 2.7.25, 2.11.13, 2.12.10, 2.13.5 |
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