# CVE-2026-11430

## Summary

- **CVE ID:** CVE-2026-11430
- **Severity:** MEDIUM
- **CVSS Score:** 7.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N)
- **CWE:** CWE-303
- **Published:** Aug 7, 2026
- **Last Modified:** Aug 13, 2026

## 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.

## Affected Products

- Trilby Media — grav-plugin-scheduler-webhook (0)
- Trilby Media — getgrav/grav (0)

## References

- [CNA](https://github.com/getgrav/grav/security/advisories/GHSA-xwv3-2mv2-w33x)
- [CNA](https://github.com/getgrav/grav)
- [CNA](https://github.com/getgrav/grav/commit/694f1dae06d9061bbf0669c4291e3b206f998d71)
- [CNA](https://www.vulncheck.com/advisories/grav-cms-scheduler-webhook-authentication-bypass-via-null-short-circuit)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.51%
- **EPSS Percentile:** 41.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._