CVE-2026-11430 Grav CMS Scheduler Webhook Authentication Bypass via Null Short-Circuit
Unauthenticated attackers can bypass webhook authentication to trigger scheduled jobs in Grav CMS when the webhook token is unconfigured.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-11430?
CVE-2026-11430 is a medium-severity authentication bypass vulnerability in Trilby Media getgrav/grav, published on 7 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-303
Which versions are affected by CVE-2026-11430?
How do I fix CVE-2026-11430?
No fix has been published for CVE-2026-11430 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-11430 being exploited?
There is no known exploitation of CVE-2026-11430 in the wild and no public exploit code.
Sources
Also known as GHSA-3m6r-m23g-m2w9.