Description (CNA)
Grav CMS's scheduler-webhook plugin contains an authentication bypass in the webhook token check. When the webhook feature is enabled but no webhookToken is configured, a compound conditional short-circuits and skips token validation, so an unauthenticated remote attacker who can reach POST /scheduler/webhook can trigger the operator's already-configured scheduled jobs by sending a single request. The primitive is triggering-existing-jobs, not attacker-chosen command execution: the attacker controls when the jobs run and which one runs (via ?job=), but does not control what the jobs do. Code execution follows only when the operator has configured a job that shells out, and even then the attacker controls timing rather than payload. Not a default-install issue: reaching the endpoint requires the separate scheduler-webhook GPM plugin to be installed, scheduler.modern.webhook.enabled to be true (default false), and no webhookToken to be configured; a stock Grav or Grav-Admin install exposes nothing here.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Trilby Media / grav-plugin-scheduler-webhook | affected 0 before 1.1.3 |
| Trilby Media / getgrav/grav | affected 0 before 2.0.9 |
CWE
CWE-303
References
- https://github.com/getgrav/grav/security/advisories/GHSA-xwv3-2mv2-w33x
- https://github.com/getgrav/grav
- https://github.com/getgrav/grav/commit/694f1dae06d9061bbf0669c4291e3b206f998d71
- https://www.vulncheck.com/advisories/grav-cms-scheduler-webhook-authentication-bypass-via-null-short-circuit
ADP enrichment
No English description supplied.
No references supplied.