GHSA-c8w2-fgvx-vhv4: kcp front-proxy does not strip inbound X-Remote-* identity headers, allowing any authenticated client to injec
HIGHCritical vulnerability — CVSS 9.9
What to do
- Critical severity — schedule an urgent patch.
# Summary The kcp front-proxy fails to strip client-supplied identity headers before forwarding requests to shards. Any authenticated tenant can inject their own `X-Remote-Group` and `X-Remote-Extra-*` headers, which the shard trusts as a verified identity assertion — allowing a low-privilege user to escalate to cluster administrator (`system:masters`) and read, write, or delete resources in any workspace on the shard. This is a complete multi-tenant isolation and authorization bypass. …
CVE · detail
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