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GO-2026-6517 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 in github.com/kcp-dev/kcp

🗓️ 28 Sep 2026 16:43:40Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 4 Views

Authenticated client impersonation in kcp front-proxy via unstripped X-Remote-* headers.

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28 Sep 2026 17:00Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.19.9
EPSS0.00384
SSVC
4