Medium, CVSS 5.9PyPIAmendedPublished
axonflow-sdk-python: Webhook signing-key (HMAC-SHA256) not exposed by SDK type, preventing signature verification
GHSA-7f4h-6264-89fr
- Affected
- PyPI axonflow < 6.7.0
- Fixed in
- 6.7.0· Vendor fix available
- Issue
- The AxonFlow SDK's WebhookSubscription (or equivalent) type did not expose the HMAC-SHA256 signing key returned by the platform's CreateWebhook endpoint. Without access to the secret through the typed SDK API, callers had no path to verify the X-AxonFlow-Signature header on incoming webhook deliveries. Affected callers had two unsatisfactory options: 1. Skip signature verification entirely — accepting any payload from any source that knew the webhook URL. 2. Hand-parse the raw HTTP JSON response to extract the secret, bypassing the type-safe SDK surface. This advisory is filed across all four AxonFlow SDKs (Go, Python, TypeScript, Java) because the same defect and the same fix landed in each. Affected versions Versions 6.6.2 and below. Impact A webhook receiver using the SDK's typed API to handle inbound deliveries had no path to authenticate the source of incoming payloads. An attacker who learned the webhook URL — through misconfiguration, log leakage, observable network…
Recommended action: Upgrade to 6.7.0 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.