@grackle-ai/powerline Runs Without Authentication by Default
Impact
When --token is not provided and GRACKLE_POWERLINE_TOKEN is not set, the PowerLine gRPC server runs with zero authentication. A warning is logged ("NO AUTH (development only)") but nothing prevents deployment in this state. Any client that can reach the PowerLine port can spawn agent sessions, access credential tokens, and execute code.
The default binding is 127.0.0.1 (loopback only), which limits exposure to the local machine. However, if PowerLine is accidentally exposed on a network (e.g., in a container or via port forwarding), the impact is critical.
Affected code:
packages/powerline/src/index.ts:46— token defaults to empty stringpackages/powerline/src/index.ts:63-76— auth interceptor is only added when token is truthy
Patches
0.70.1
Fix: Require an explicit --no-auth flag to run without authentication, rather than defaulting to no auth when the token is empty. Throw an error if starting without a token and without --no-auth.
Workarounds
Always provide --token or set GRACKLE_POWERLINE_TOKEN when starting PowerLine. The Grackle server does this automatically when managing PowerLine lifecycle.
Resources
- CWE-306: Missing Authentication for Critical Function
- File:
packages/powerline/src/index.ts
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @grackle-ai/powerline | < 0.70.1 | 0.70.1 |
References
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N- Weakness (CWE)
CWE-306- Platform
- npm
- Package
@grackle-ai/powerline- Disclosed
- 25.03.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-xq7h-vwjp-5vrh - CC BY 4.0
Vulnerability history: @grackle-ai/powerline
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 03.2026 07.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 1
Disclosures per year
- 2026: 2
-
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