CVE-2026-18674 Missing authorization in Kong Mesh
Authenticated zones can bypass cross-zone isolation to inject or overwrite resources in other zones' namespaces on the Kong Mesh global control plane.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18674?
CVE-2026-18674 is a high-severity missing authorization vulnerability in Kong Mesh, published on 17 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
On a Kong Mesh global control plane, resources received over the zone-to-global KDS sync are attributed using the in-band, sender-controlled ControlPlane.Identifier rather than the authenticated zone identity derived from the connection. Authenticated zones can have the global control plane store and re-distribute those resources as belonging to another zone.
The result is a cross-zone isolation bypass: the holder of a single enrolled zone's credential can inject, attribute, and overwrite resources in another zone's namespace mesh-wide.
The root cause lives in Kuma's open-source KDS sync code, which Kong Mesh's control plane is built on.
Which versions are affected by CVE-2026-18674?
How do I fix CVE-2026-18674?
No fix has been published for CVE-2026-18674 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-18674 being exploited?
There is no known exploitation of CVE-2026-18674 in the wild and no public exploit code.
Sources
Also known as GHSA-fxcr-qwx6-5h7q, GHSA-m58j-fjmc-h3g4.