cve.bz

CVE-2026-61682

9.9 criticalEPSS 0.4%

Critical (9.9). EPSS 0.4% chance of exploitation in the next 30 days. Fixed in github.com/kcp-dev/kcp 0.31.4, 0.32.2.

kcp is a Kubernetes-like control plane for form-factors and use-cases beyond Kubernetes and container workloads. Prior to 0.31.4 and 0.32.2, the kcp front-proxy does not remove inbound X-Remote-User, X-Remote-Group, or X-Remote-Extra-* identity headers before forwarding requests to shards. Any authenticated tenant can inject X-Remote-Group: system:masters, authorization.kcp.io/warrant, authentication.kcp.io/scopes, or a group used for per-workspace required-group gating, and the shard trusts these values as authenticated identity assertions. This allows cross-workspace impersonation, authorization bypass, and arbitrary reading, writing, or deletion of resources, secrets, RBAC data, APIExports, APIBindings, and LogicalClusters. This issue is fixed in versions 0.31.4 and 0.32.2.

Severity

CVSS 3.1

9.9 critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS
0.4% chance of exploitation in the next 30 days; higher than 32% of CVEs (scores of 2026-10-31)
CWEs
CWE-290, CWE-302, CWE-348
Published
Modified
Record from
the NVD, synced

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-c8w2-fgvx-vhv4Gogithub.com/kcp-dev/kcp<0.31.40.31.4
GHSA-c8w2-fgvx-vhv4Gogithub.com/kcp-dev/kcp>=0.32.0 <0.32.20.32.2
GO-2026-6517Gogithub.com/kcp-dev/kcp<0.31.4
>=0.32.0 <0.32.2		0.31.4, 0.32.2

References

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