Answer in brief
CVE-2026-61682 records a Critical severity (CVSS 9.9) vulnerability in kcp front-proxy does not strip inbound X-Remote-* identity headers, allowing any authenticated client to inject groups/warrants and impersonate system:masters in any workspace. The current sources do not mark it as known exploited. The current feed maps kcp-dev/kcp (generic), github.com/kcp-dev/kcp (go), github.com/kcp-dev/kcp (go). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps kcp-dev/kcp (generic), github.com/kcp-dev/kcp (go), github.com/kcp-dev/kcp (go). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| kcp-dev/kcpgeneric | < 0.31.4 || >= 0.32.0, < 0.32.2 | Not reported |
| github.com/kcp-dev/kcpgo | <0.31.4 | 0.31.4 |
| github.com/kcp-dev/kcpgo | >=0.32.0,<0.32.2 | 0.32.2 |
Published upstream
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 18, 2026
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.
Quoted source text, attributed separately from HOL analysis.