EUVD-2026-30958
GHSA-78hq-926c-2xmr
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
8DescriptionNVD
Windmill prior to 1.703.2 contains an incorrect default permissions vulnerability in nsjail sandbox configuration files where /etc is bind-mounted without read-write restrictions, allowing authenticated users to write arbitrary entries to /etc/hosts, /etc/resolv.conf, and /etc/ssl/certs/ca-certificates.crt from within script execution sandboxes. Attackers can exploit persistent poisoned entries across all subsequent script executions on the same worker pod to redirect hostnames, intercept DNS queries, perform transparent HTTPS man-in-the-middle attacks, and intercept WM_TOKEN JWTs to gain workspace-admin access to victim workspaces across tenants.
AnalysisAI
Cross-tenant DNS and TLS poisoning in Windmill versions prior to 1.703.2 allows authenticated low-privilege users to write to /etc/hosts, /etc/resolv.conf, and the system CA bundle from inside nsjail script sandboxes, persisting tampered state across every subsequent job on the same worker pod. Because poisoned entries survive between executions, attackers can hijack hostname resolution, perform transparent HTTPS man-in-the-middle, and steal WM_TOKEN JWTs to escalate to workspace-admin in other tenants. …
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RemediationAI
Within 24 hours: Inventory all Windmill deployments and confirm versions (alert on versions < 1.703.2). Within 7 days: Upgrade to Windmill 1.703.2 or later on all worker pods and validate nsjail sandbox isolation in staging environment. …
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External POC / Exploit Code
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