CVE-2026-47107 Windmill < 1.703.2 Incorrect Default Permissions in nsjail Configuration
Authenticated users can write to system files in the sandbox to intercept traffic and steal tokens, gaining admin access to other workspaces.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-47107?
CVE-2026-47107 is a high-severity vulnerability in windmill-labs windmill, published on 19 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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 other users' workspaces.
Weakness: CWE-276
Which versions are affected by CVE-2026-47107?
How do I fix CVE-2026-47107?
No fix has been published for CVE-2026-47107 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-47107 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-47107 exists.
Sources
Also known as GHSA-78hq-926c-2xmr.