CVE-2026-59157

Summary

webhookd is a minimalist webhook server that triggers shell scripts and external processes through HTTP requests. Prior to 1.22.0, webhookd deployments without htpasswd authentication forwarded all incoming HTTP headers through HTTPParamsToShellVars in pkg/api/index.go into the hook script environment without an allowlist. When an upstream reverse proxy did not strip a client-supplied X-WebAuthn-User header and a hook script trusted that variable for identity or privilege, a remote unauthenticated attacker could spoof another user, bypass script security controls, and access or modify resources available to the impersonated identity. This issue is fixed in version 1.22.0.

Affected Software

VendorProductVersion RangeStatus
ncarlierwebhookd< 1.22affected

Weaknesses

  • CWE-290: CWE-290: Authentication Bypass by Spoofing
  • CWE-807: CWE-807: Reliance on Untrusted Inputs in a Security Decision

References